Currently, Shoulder Charge isn't consumed upon use unless it hits an enemy. The ability is about to become a 1 hit kill in the crucible in Forsaken, meaning once it hits an enemy, in all but the rarest cases, a kill is guaranteed. The Insurmountable Skullfort gives melee charge back immediately upon getting a kill with the melee ability.
Basically, Titans rocking Shoulder Charge and Skullfort will ALWAYS have a melee charge in crucible, it'll be EXACTLY like D1 where Shoulder Charge could be used whenever and wherever.
The instant this update goes live, I'm going to be carrying a shotgun with me at all times.
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As a titan from D1, I'm very looking forward to it. It's not really that OP, as I noticed the lunge for SC isn't as glorious as it once was, and besides, the other classes have their exotics that really buff them so I think it might be the titan's turn to have something awesome for crucible :)