So far (unless there is somewhere further in sunsinger) from what I've seen a warlocks melee compared to the others is underpowered, titans have a one hit lunge melee as strikers and hunters have a one hit blink melee as blade dancers does a warlock ever get a one hit melee??
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Blink Strike isn't a 1 hit kill, unless you're referring to backstab... I don't think any of the melee attacks are 1 hit kills without buff skills