Engineer or Medic?

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Tinkerer path gains small ammo crate, barricade, heavy barricade, and explosive barrel. Small Ammo Crate is a one time use ammo refill that can be placed on the ground like a deployable shield. Barricade and Heavy barricade are like deployable shields, except stronger (and you have to build them up). Explosive barrel is a barrel you place on the ground and hit to detonate, killing Nords in the general vicinity.