Committing suicide by using a self-damaging ability to kill your character counts as a player-caused kill and does not have the -10% durability penalty attached to it.

This does not apply to dying from a hazardous environment, such as standing in fire, swimming in lava, or jumping off a cliff.

Suicide by spells/skills

• Divine Intervention: when protecting someone with this spell, the paladin automatically die.
• Hellfire: a warlock spell.
• Seal of Blood / Seal of the Martyr: a paladin spell. These abilites were removed in Patch 3.2.0.
• Shadow Word: Death: Dying from this priest ability will not reduce the caster's durability.

Suicide by items

• [Skull of Impending Doom]: a quest reward
• [X-52 Rocket Helmet]: dying from the damage received upon activation of the X-52 Rocket Helmet won't reduce durability, however death by falling damage after it has been activated will.
• [Videre Elixir]: used to kill one's self at the Gadgetzan graveyard for the quest Meet at the Grave; the quest's completer is a ghost who's only visible to dead players.
• [Crystal of Zin-Malor]: an Alliance-only item. Ideal for canceling flight paths. This trinket will drain health and mana until the player dies or unequips it. No longer equipable as of Patch 3.1.0.