Instantiations From Other Worlds

As is widely known, it is possible through an act of will or some arcane process for beings from other worlds to appear - briefly - in our own. These instantiations are of varying degrees of corporeality and power, and some have speculated that their ever-varying physical appearances are as a result of refractions in the space between worlds, which cause their manifestation in our reality to warp and shift away from their true nature.

When an instantiation or instantiations appear, perform the following steps:

1. Determine Corporeality

Roll a d4:

1. Entirely incorporeal. Can neither physically affect the world, nor be affected by it, except through magic spells. Appears like a gossamer-thin approximation of its form.
2. Mostly incorporeal. Can pass through walls and is unharmed by non-magical weapons. Appearance is noticeably faded and transparent.
3. Semi-corporeal. Can pass through walls and takes half damage from non-magical weapons. Appearance is translucent.
4. Fully corporeal. Acts as though it is fully present in our reality.

2. Determine Time Span

Roll a d6 to determine the number of turns for which the instantiation appears.

3. Determine Power.

Roll a d6+1 to determine Hit Dice. For every Hit Dice, the instantiation has a spell-like ability which it can cast once.

4. Determine Spell-Like Abilities.

Dice	Ability	Dice	Ability	Dice	Ability
1	Blink	11	Feeblemind	21	Fire Shield
2	Hold Person	12	Telekinesis	22	Call Lightning
3	Slow	13	Polymorph Other	23	Dispel Magic
4	Scare	14	Confusion	24	Stinking Cloud
5	Dimension Door	15	Knock	25	Shatter
6	Web	16	Enlarge	26	Wall of Fog
7	Wizard Lock	17	Darkness 15’ Radius	27	Ice Storm
8	Magic Missile	18	Shadow Monsters	28	Hallucinatory Terrain
9	Shield	19	Paralysation	29	Phantasmal Force
10	Fireball	20	Hold Portal	30	Disintegrate

5. Determine Basic Torso

Roll to discover the basic body shape of the instantiation. 

Dice	Basic Form
1	Horizontal disc
2	Vertical disc
3	Sphere
4	Oblong
5	Cylinder
6	Cube
7	Blubbery mass
8	Stick
9	Ring or circle
10	Humanoid torso

6. Determine Arms/Hands

Dice	Arms/Hands
1	Human arms
2	Grasping claws on the end of long worm-like arms
3	Hooks on the end of whip-like arms
4	Pincers
5	Weak, pawing hands
6	Tentacles
7	Gulping mouths on the end of sinewy arms
8	Curious, searching feelers
9	Sharp spikes for arms
10	Hands with long, alien, suckered fingers

7. Determine Locomotion

Dice	Locomotion Method
1	Hovering
2	Too many legs
3	Insectoid, chitinous legs
4	Membranous wings
5	Sliding along the ground
6	Thick, lumbering legs
7	Thin, gracile legs
8	Absurdly long striding limbs
9	Pair of humanoid legs
10	Immobile

8. Determine Substance

Dice	Substance
1	Fleshy
2	Reptilian
3	Insectoid
4	Hairy
5	Metallic
6	Crystalline
7	Stone-like
8	Perfectly smooth
9	Plant-like
10	Liquid contained in an invisible membrane

9. Determine Attack Method

Roll a d4 to determine. 

1. Psychic blast. Attack ignores AC.

2. Physical attack. Uses arms/hands.

3. Beam. A line of force or burning light.

An instantiation has one attack doing d6+1 DMG for every 2 HD it has.