Like bruh come on... The mod costs 7 Energy and it doesn't even work.
I don't wanna be that guy, but when u introduce a new melee or grenade it should be tested if it works with all exotics, perks and mods before pushing the update. Look at Celestial Fire on the warlock which still hasn't been fixed to properly trigger perks like Sunbracers or any other melee kind of perk. It only triggers it if the enemy dies from burn damage.
Video:
https://www.youtube.com/watch?v=x4iJ51xwFbs
Anyway here is the Celestial Fire example:
https://vimeo.com/719771247
Edit:
After further test Melee Wellmaker seems to work, the rest still don't.
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Celestial fire counts as scorch kills ..not melee kills.