Invulnerable Creature

'Invulnerable Creature' is a pattern that can be added to any creature to indicate very, very durable entities. Such creatures gain an Invulnerability power, that renders them immune to hit point damage. While they are in this Invulnerable state, they can only use a swift action to cancel their invulnerability, and are only subject to Sunders or other sources of siege damage. Note that they are still affected by any Conditions, but if those conditions inflict hit points, that damage is ignored.

This invulnerability can come from many sources of power. Perhaps they transmute into a cloud of gas, or a wriggling mass of worms. Maybe they cover themselves in a shell of chitin, or turn themselves to solid stone, or become ethereal. Maybe they are shrunken to the size of an invisible mote, and their form left behind is only illusory. The possibilities are endless!

Invulnerable creatures can serve as a real headache to adventurers who lack flexibility, and can demand innovative tactics and thinking to defeat. For example, Paralyzing an Invulnerable creature and waiting patiently until their power expires is usually deadly effective, if you have the means to swing such a thing!

An Invulnerable Creature uses all of the base creature's statistics and abilities except as noted below.

CR (challenge rating)

Same as base creature +2.

Size and Type

The creature's Size does not change. Its Type remains the same but it gains the subtype Invulnerable.

Initiative Modifier

The creature's initiative modifier increases by +1.

Senses

All senses such as scent, tremorsense, keen hearing, etc are unchanged. An Invulnerable Creature gains +3 on Perception skill rolls.

Armor Class

Invulnerable Creatures gain +1 AC.

Hit Dice

Invulnerable Creatures gain +1 hp per Hit Die of their adjusted CR.

Defensive Ability

The Invulnerable Creature gains the following abilities, which may be added to their Bestiary entry:

Invulnerability: An invulnerable creature can turn itself into an object (such as iron, wood, itself as time-frozen being, shimmering force-field, stone, etc.) once per round as a swift action. While Invulnerable, it can take no actions except a swift action to cancel their invulnerable state, and thus cannot move, attack, activate any abilities, or anything else, although the GM may allow them to talk, depending upon the special effects of their power and the dictates of the story. While invulnerable, they are still subject to most Status Conditions, although the GM may rule that weird effects simply don't work, and status conditions which inflict hit points have no effect.

While Invulnerable, these creatures are considered to be objects, and thus are not subject to hitpoint damage. While Invulnerable, they must be Sundered to do harm to them. Sunder maneuvers are made against the normal Maneuver Defense of the creature, and siege damage from other means is resolved as defined in that ability. The GM adjudicates all unusual situations.

If the Invulnerable Creature is subjected to Sunders, it has a Durability of 2 plus its adjusted CR/5, dropping fractions (thus, Durability of 2 to 10). The number of points of Durability damage it has suffered is tracked separately from its hit points, and if either its Durability or its hit points is reduced to zero or less, it is killed. Turning Invulnerability on or off is a swift action, each doable once per round, assuming it can garner two swift actions in a round (usually by degrading a move action or a standard action to a second swift action).

Note that if any combat with Invulnerable creatures lasts ten rounds, their Invulnerable power is negated for the rest of that day.

SR: - Same as Base Creature

Special Defenses: Same as Base Creature

• Invulnerable Creatures gain a +1 untyped bonus on all Saving Throws.

Immunities: Same as Base Creature.

Weaknesses: Same as Base Creature

Out of Combat

Same as Base Creature.

Speed

An Invulnerable Creatures base speed improves by ten feet in all movement categories it has.

Melee Attacks

The Invulnerable Creature retains all the base creature's attacks . It gains a +2 untyped bonus to-hit with all attacks.

Damage

The Invulnerable Creature does the same damage and effects as the base creature. It gains a +2 untyped bonus to all damage it inflicts, and all DC's are raised by +1.

Space and Reach

No Changes.

Offensive Ability

No Changes.

Ability Scores

No Changes.

Maneuver Offense and Maneuver Defense

The Invulnerable Creature gains a +2 untyped bonus to Maneuver Offense and Maneuver Defense rolls.

Feats

Optionally, add one non-combat oriented feat, for flavor. Or just wing it! DM fiat is a wonderful thing.

Skills

Optionally, add one skill at CR+10.