Hey bud. Slam isn't a skill. It's a racial ability. If you play a class that gets bash, it will use that (for accuracy, damage, skillups) but otherwise it's just a chance to hit for minimal damage with a stun/interrupt.
Something to consider, it uses the same timer as backstab. So you'll only use it (at most) to interrupt when you can't push it fast enough or if you're soloing a caster that you don't want casting much. It's better to have it, than not, but it's situational.
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