Classes:InvulnerabilitySphere

Note: Wait! Stop! Before you copy this actor's definition into your mod, remember the following things: You do NOT need to copy that actor, since it is already defined. In fact, it's not just useless, it will cause problems. If you want to modify it, or use a modified version, using inheritance is the way to go. The actor definitions here are put on the wiki for reference purpose only. Learn from them, don't copy them.

Invulnerability sphere
Actor type	Powerup	Game	(Doom)
DoomEd Number	2022	Class Name	InvulnerabilitySphere
Spawn ID	133	Identifier	T_INVULNERABILITY

Classes: Inventory→PowerupGiver→InvulnerabilitySphere

The invulnerability sphere is a green sphere with a grinning, red-eyed face appearing on it. When picked up, the player becomes invulnerable and sees everything through an inverted white map.

If the item is imported in Heretic or Hexen, its effect when picked up will vary because it depends on the game and on the player class's Player.InvulnerabilityMode feature rather than by the item itself. See here for the details. If the item is imported in Strife, it'll behave exactly as in Doom.

DECORATE definition

ACTOR InvulnerabilitySphere : PowerupGiver
{
  +COUNTITEM
  +INVENTORY.AUTOACTIVATE
  +INVENTORY.ALWAYSPICKUP
  +INVENTORY.BIGPOWERUP
  Inventory.MaxAmount 0
  Powerup.Type "Invulnerable"
  Powerup.Color InverseMap
  Inventory.PickupMessage "$GOTINVUL" // "Invulnerability!"
  States
  {
  Spawn:
    PINV ABCD 6 Bright
    Loop
  }
}

note: Invulnerability sphere respawns only if sv_respawnsuper is set.