Sever

One hit kills. Four spells on a short cooldown. Kills refund your whole kit.

• Guard (Q)  block everything for 1.2s.
• Blink (W)  teleport through walls, one or two charges, depending on the mode. 
• Kunai (E)  a piercing throw that kills every enemy in its line, allies untouched. Cheapest cooldown in the kit.
• Hunt (R)  a homing bolt that can't miss by aim.

Bonus:

• Second Wind (D) — once a round, reset every cooldown. 

A kill refunds your whole kit. Allowing outplays when outnumbered and kills in rapid succession for fast players.