The Titans and Hunters can spam their one hit kill supers (especially the titan) but the warlocks arc takes time to wear down an opponent and the void only gives one shot (not multiple like the other classes) an no one uses sunsinger so who cares.
Either nerf the others or buff the warlock.
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Stormcallers are actually pretty op when it comes to certain situations like when you hover over a sunbreaker(if you survive) activate your super and blind them watching as the sunbreaker struggling to hit you while you chip away slowly and painfully at there health this is just one of many possible situations I managed to clutch a 4-4 on an elimination with this tactic