I think that sunsinger does need a buff but it shouldn't be this. I think they need to switch Viking funeral's and touch of flame's places on the skill tree and then undo the firebolt grenade nerf however not the Viking funeral nerf. That way you could run double burn bolts. It definitely wouldn't be as good as it was with the old Viking funeral but that alone would go a long way.
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Felwinter Relic allows for that. As it is I find Solar Grenade is the strongest in PVP It can hit, tag, debuff multiple people instantly. Sunbreaker Guantlets make that spot 10 seconds of Nope. I've stopped team advances into B just by placing Nades. Usefull for making Snipers bug off to clear up kill lanes. Grand to surprise Heavy Ammo. Ps I need a Nightstalker Volunteer to help me with sneak tactics.
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I mean yeah I know felwinter artifact can allow that but I mean like and still allow it to use super. Keep in mind I have literally no experience with sunsinger though so I don't know much about it.