Nobody uses Arc. Prismatic has everything that’s good in Arc and more, AND it has survivability for all classes.
Sure, Titans have knockout and Hunters have combination blow. Warlocks have nothing, and the other two have it tied to a melee or an aspect. Give Arc some good survivability, given how close you have to get to enemies for it to be effective.
And don’t give us some awful damage res, like you did with frost armour. It’s so useless.
Edit: Have the healing aspect of arc be tied to amplified, that makes it much simpler.
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The Amplified Damage Resist perk on the Artifact during the Plunder, Deep, and Echo Seasons was very useful, made it much easier to survive most incoming attacks while running around and picking up Orbs of Power. I use Arc a lot but I don't think it particularly needs healing. Two Subclasses have Healing already (Solar and Void) while another two have Damage Resistance (Stasis and Strand) so it does make more sense for Arc to be in between and focus on fast Ability recharging. Titan has Insurmountable Skullfort on Melee kills, which also exists on Warlock with Karnstein Armlets, not sure what Hunters get other than Liar's Handshake but there are alternative options for healing. It would be nice to have an Aspect or Fragment that gives that Amplified damage resist, but even adding it to Exotic Armor would work.