d20 Adamant Entertainment Monster Modifier.pdf

Monster

Modifier

By Gareth-Michael Skarka

Introduction

“You see a lumbering, 9-foot-tall humanoid, lurching

towards you. It’s hunched over at the shoulders, it’s

arms nearly dragging the ground. Its rubbery skin is

the color of green moss, and it has tufts of greenish-

black hair....”

“It’s a Troll -- everybody break out your ire

attacks...”

How many times has this happened to you?

Monsters should give the players a thrilling

encounter, but it’s incredibly dificult to give a sense

of fear of the unknown, when your players have had

the usual assortment of monsters memorized for a

decade or more.

That’s where this product comes in.

Modifying Monsters

With a small bit of work, it is possible to modify any

creature. Take the basic stat block of any monster, and

then roll on the tables provided herein. In a sense, the

Monster Modiier creates a one-of-a-kind template which

is then immediately applied to a creature.

Some of the changes will increase a creature’s CR. If

the total CR increase is less than 1, there is no increase;

for values greater then 1, round up if the total is 50% or

more to the next highest CR. (A CR bonus of +0.9 equals

no change to CR, a CR bonus of 1.5 equals CR+2, and a

CR bonus of 1.25 equals CR+1).

Scales : The creature is covered with scales, akin to a reptile. This

provides it with DR 3/-, in addition to any other DR.

To use the Monster Modiier:

CR Adjustment: +0.6

Step 1: Number of modiications

Roll 1d4+1 for the number of changes to the base

creature.

Armor Plates: The creature has extremely thick and heavy armor

plates, like a turtle. It gains DR 6/-, in addition to any existing

DR, but it loses 5’ of ground movement (Minimum ground

movement is 5’). If it lies, its maneuverability decreases by 1

step and its light speed is reduced by 10’. (Minimum light speed

is 5’)

Step 2: Determine modiication type

For each modiication, roll on the following table to

determine the type.

CR Adjustment: +0.75

d% Roll

Type

01-15

Skin Change

Acidic: The creature’s skin exudes a potent corrosive acid.

Any metal weapons which touch it take 2d4 points of damage,

ignoring hardness. Any unarmed attack against it results in the

attacker taking 2d4 points of acid damage if the attack roll would

hit the creature’s touch defense (even if it does not overcome the

total defense). If the creature is grappled, the grappling character

takes 2d6 points of acid damage for each round the acidic

creature is held.

16-30

Movement Change

31-40

Special Ability

41-55

Attack Change

56-70

Size Change

71-00

Cosmetic Change

Step 3: Determine speciic modiications

Roll on the appropriate sub-table to determine the

speciic modiication

CR Adjustment: +1

Sticky : The creature’s skin exudes a sap-like substance which

can hold weapons fast. If an attack would hit the creatures touch

defense (whether or not it does damage), the attacker must make

a Strength check (DC of 10 plus the creature’s hit dice plus

1/2 the creature’s Constitution bonus) to pull the weapon free.

Otherwise, it remains stuck to the creature’s hide. If the creature

is grappled or it grapples a character, a Strength check at the same

DC is required to break free or to end the grapple, in addition

to the normal grapple checks. Anyone who makes an unarmed

attack and is stuck is considered to be grappling the creature.

Skin Change

The outer surface of the creature is different from that of the base

creature.

Roll d% Result

01-05

Chameleon

06-20

Thick Fur

21-30

Slick

CR Adjustment: +0.75

31-45

Scales

46-60

Armor Plates

Elastic : The hide of the creature is extremely lexible and springy,

making it very dificult to cut. Slashing or Piercing weapons do

only half damage against it.

61-65

Acidic

66-70

Sticky

71-75

Elastic

CR Adjustment: +0.5

76-80

Padded

81-90

Luminescent

Padded : The creature has a thick layer of fat or muscle or the like

underneath its skin. This helps to cushion it against blows, so that

crushing weapons do only half damage against it.

91-95

Distorting

96-00

Roll twice

CR Adjustment: +0.5

Chameleon : The creature’s skin shifts in color in order to match

the background. It gains a +8 racial bonus to Hide checks,

and may hide even if there is no cover or if it is being directly

observed.

Luminescent : The creature’s skin glows brightly, and often

produces whorls and vortices of light when it is struck in combat.

Such brilliant lares make it dificult to hit, granting it a +2

natural bonus to defense. However, it suffers a -6 racial bonus to

Hide checks.

CR Adjustment: +0.25

Thick Fur : The creature is extremely hairy and well-protected

from the cold. This grants it DR 2/- (in addition to any existing

DR) and Elemental Resistance (Cold) of 5.

CR Adjustment: +0.25

Distorting : The skin of the creature has some truly exotic

properties that warp and refract light. The beast is not always

where it seems to be. All attacks against it suffer a 20% miss

chance.

CR Adjustment: +0.5

Slick: The creature’s skin exudes a slimy mucous which makes it

very dificult to grab or hold. All attempts to grapple the creature

suffer a -4 circumstance penalty.

CR Adjustment: +0.5

CR Adjustment: +0.1

Movement Change

The creature either gains a new mode of movement or is much

faster in one of its old modes of movement.

Brachiating : This allows the creature to move very rapidly among

the treetops, by swinging on large arms, by jumping swiftly from

branch to branch, or otherwise using the foliage to propel itself.

The creature cannot use this ability if it is on the ground, though

it can make a DC 10 jump check to reach low-lying foliage as a

standard action and then take a move action through the trees.

Roll

Result

01-15

Flight

16-60

Ground

If the creature has no brachiating movement, it gains it at a base

of 20’ for Medium or smaller creatures, and 10 feet for Huge

or larger creatures, who must be more cautious as they leap

from branch to branch. If the creature already has brachiating

movement, its speed increases by 25% or 5’, whichever is greater.

61-80

Burrowing

81-85

Swimming

86-90

Brachiating

91-95

Teleporting

96-00

Speed

CR Adjustment: +0.25

Flight : If the creature could not ly, it now can. It gains a

light speed equal to 150% of its fastest other speed, with

maneuverability determined as follows:

Teleporting : This ability is a consequence of mutation, deliberate

modiication, or psionic power. The creature can move by

blinking from point to point, covering no ground. It can instantly

escape from any grapple. It teleports as a free action (though

it can take only one per turn) and can act immediately upon

completing the teleport. It is considered to lank any creature it

threatens in the round after teleporting, due to the suddenness of

its appearance. It cannot teleport into an occupied square or to

any location it cannot see.

Size

Maneuverability

Tiny or smaller

Good

Small

Average

Medium

Poor

Large or bigger

Clumsy

If the creature already has light, its speed increases by 25%

(round to the nearest 5 feet) or 10 feet, whichever is greater,

and its maneuverability increases by one step, to a maximum of

perfect.The means of light can be wings, gas bladders, psionic

levitation, or anything else which seems appropriate.

Base teleport distance is 50’. If this modiication is rolled again,

increase the base distance by 20’.

CR Adjustment: +1. (Remains +1 even if rolled multiple

times)

CR Adjustment: If the creature lacked light, +0.5; if it

Speed : An existing movement mode is increased by 25% or

10’, whichever is greater. The Game Master should pick an

appropriate movement mode.

already had light, +0.25.

Ground : If the creature has no ground movement, it gains it at

a base of 10 feet for Medium or smaller creatures, and 20 feet

for Huge or larger creatures. If the creature already has ground

movement, its ground speed increases by 25% or 10 feet,

whichever is greater.

CR Adjustment: +0.25

Special Ability

The creature either gains a new special ability or improves an

existing ablity in some manner.

CR Adjustment: +0.25

Burrowing : If the creature has no burrowing movement, it gains it

at a base of 10 feet for Medium or smaller creatures, and 20 feet

for Huge or larger creatures. If the creature already has burrowing

movement, its burrowing speed increases by 25% or 10 feet,

whichever is greater.

The Game Master should choose a special ability possessed by

some other creature (there are far too many choices to be able to

list them all here), or manifestly improve a special ability already

possessed by the creature.

Burrowing can be accomplished by hard ground-digging claws,

exuding an acid which dissolves the ground, psionically ‘phasing’

through the dirt, and so on. Burrowing creatures automatically

gain Tremorsense.

CR Adjustment: If the creature lacked burrowing, +0.25;

if it already had burrowing +0.1.

Swimming : If the creature has no swimming movement, it gains

it at a base of 30 feet for Medium or smaller creatures, and 40

feet for Huge or larger creatures. If the creature already has

swimming movement, its swimming speed increases by 25% or

10 feet. In addition, any creature which gains swimming gains the

[Aquatic] subtype.

CR Adjustment: 0

Attack Change

The creature either gains a new attack mode or improves an

existing attack in some manner.

it’s claw attacks against more distant targets. The game master

should choose a natural attack which seems appropriate. The

reach is increased by 5’ over the creature’s normal reach, and an

additional 5’ each time this modiication is added.

CR Adjustment: +0.25

Roll

Result

01-15

Claws

Poison : One of the creature’s natural attacks (ideally, one which

does piercing or slashing damage) gains poison.

16-25

Bite

26-35

Slam

36-45

Gore

Roll on the table below to determine which attribute the poison

effects:

46-50

Sting

51-55

Tentacle

56-60

Reach

Roll

Attribute

61-80

Poison

1-3

Constitution

81-85

Paralysis

4-5

Dexterity

86-90

Penetrating

6-7

Strength

91-94

Fast

Intelligence

95-00

Wounding

Wisdom

Charisma

Claw, Bite, Slam, Gore, Sting, or Tentacle : If the creature lacks an

attack of this form, it gains one, with appropriate damage for its

size (CR Adjustment: +0.25). If the creature already has an attack

of this form, roll on the following table

Poison damage is based on creature size, as follows:

Size

Fortitude DC

Damage

Tiny

Roll Result

Small

1d2

Medium

1d3

The damage for this natural weapon increases

by one step, as if the creature’s size had

increased by one category: 1d2, 1d3, 1d4, 1d6,

1d8, 2d6, 3d6, 4d6, 6d6, 8d6, 12d6.

Large

1d4

Huge

1d6

A weapon or attack that deals 1d10 points of

damage increases as follows: 1d10, 2d8, 3d8,

4d8, 6d8, 8d8, 12d8.

Gargantuan

1d8

Colossal

1d10

CR Adjustment: +0.25

If this modiication occurs twice, either increase the Save DC by

2 or the damage by 1 step.

The threat range for the weapon doubles.

CR Adjustment: +0.25

CR Adjustment: +0.5

Paralysis : One of the creature’s natural attacks inlicts paralysis.

The Fortitude save is equal to 10+1/2 the creature’s hit dice +the

creature’s Constitution modiier. The target will be paralyzed for

2d4 rounds.

The critical multiplier for the weapon increases

by 1.

CR Adjustment: +0.25

CR Adjustment: +0.5

Fast : The creature gains the Improved Initiative feat.

The creature gains an extra instance of the

natural weapon (so it would have 2 x gore

instead of a single gore attack, for example).

Any rolls which increase the effectiveness of

the natural weapon increase all instances of it.

CR Adjustment: +0.25

CR Adjustment: +0.1

Wounding : The damage from one of the creature’s attacks causes

grievous wounding. It will bleed at 1 point per round unless a

Treat Injury (DC 10) check is made.

CR Adjustment: +0.25

Reach : Although the creature’s base size does not change, one

of its natural weapons becomes a reach weapon. This might

indicate that a creature has gained a giraffe-like neck, allowing it

to bite targets far away, or extremely long limbs so that it can use

Size Change

The creature is signiicantly larger or smaller than the base

creature. Roll on the following table. Size cannot drop below

Fine or above Colossal.

Roll

Result

01-30

1 step larger

31-50

2 steps larger

51-70

3 steps larger

71-85

1 step smaller

86-95

2 steps smaller

96-00

3 steps smaller

Changing a creature’s size affects a creature’s ability scores,

DV, attack bonuses, and damage values as indicated on the tables

below. Repeat the adjustment if the creature moves up more than

one size. CR Adjustment: plus or minus 1 for each step.

Old Size

New Size

Str Dex Con

Attack

Fine

Diminutive

Same -2 Same

Same

-4

Diminutive

Tiny

+2 -2 Same

-2

Tiny

Small

+4 -2 Same

-1

Small

Medium

+4 -2 +2

-1

Medium

Large

+8 -2 +4

-1

Large

Huge

+8 -2 +4

-1

Huge

Gargantuan

+8 Same +4

-2

Gargantuan

Colossal

+8 Same +4

-4

Colossal

Gargantuan

-8 Same -4

-1

Gargantuan

Huge

-8 Same -4

-2

Huge

Large

-8 +2 -4

-2

Large

Medium

-8 +2 -4

-1

Medium

Small

-4 +2 -2

Small

Tiny

-4 +2 Same

Tiny

Diminutive

-2 +2 Same

Diminutive

Fine

Same +2 Same

Same

Old Damage (each)

New Damage

1d2

1d3

1d4

1d6

1d8

2d6

1d10

2d8

2d6

3d6

2d8

3d8

Reverse the steps if creature is being reduced in size.

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