The solar grenade duration seems too short.
Celestial Fire does not reliably activate the perk.
In general, the powered melee kill activation requirement seems impractical given the abundance of kill chaining abilities in the game now. It should probably be reworked to something that doesn't get yoinked from the player's powered melee kill attempt so easily in group activities.
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Bungie managed to nerf the only two powerful endgame builds for Warlocks at the same time.