Tanks. For example, the shade in the King's Fall raid that swings it's big fat chode at you. Have the Warlock take the hit and self revive, less risk of losing someone.
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So basically, dying. ¯\_(ツ)_/¯
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Also self revive is the biggest cheese in Destiny.
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Or have increased armor with radiance and pull out a sword + Solar Armor. Insane damage resistance.