Wikipedia, "Goblin (Dungeons & Dragons)":
Nilbogs are, according to the game description, a type of naturally-born but magical goblins that are healed by receiving damage and are damaged by healing spells.[26] Furthermore, they project a paradox area effect in whose radius every intended action is twisted so that the exact opposite is carried out (i.e.: instead of hitting a nilbog with a weapon, one might end up attacking a companion; or instead of plundering a treasure hoard, an adventuring party under the influence of "nilbogism" might actually end up adding their own wealth to it). The name of this sub-species is "goblin" spelled backward, a reference to this reversal of effects.
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