The way it stands sunbreaker needs to stay the way it is because Hammer of Sol is literally the only good thing about Sunbreaker AND literally all of our perks relate to Hammer of Sol either directly or indirectly.
If the class as a whole was rebalanced so Hammer of Sol was weaker BUT we had better grenades, perks that buffed melee or grenades or even just passive boosts on weapon kills like Chain of Woe I would be fine with a Hammer nerf.
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Simmering Flames is a buff to Melee and nades. Doubling the rate of cool down when super is charged. One change I would like to see would be if Explosive Pyre was applied to all ability kills. Again this would cause synergy between Simmering flames and explosive pyre giving an alternative to a super focused build for PVP