Pvp only. It's honestly kind of crappy that they can just continually throw one shotting projectiles and never take damage from it at a close range. Also a reduction of damage when you're only in splash radius. It shouldn't kill you if a tiny ember hit you from far away.
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Dude, you must not know what it was like when Sunbreakers were first introduced into the Crucible. Because boy I want to slap you