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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Honestly, Hammer of Sol is one of the easiest supers to countee if you know what to do. What I do is get on top of something so I can have the hight advantage. This allows me to avoid most of the Titan's hammers. I then begin landing headshots with my Boolean Gemini. It works