Requirement: Endurance 3, Power 3
While charging powers from both mutations and spheres, you can block physical attacks.
Blocking this way also consumes stamina.
If you're charging a power with your back to an enemy and they launch an attack, you'll use the power instantly and won't block the damage, but you won't spend stamina either.
If for any reason, an enemy's attack cancels your powers while you were charging them, you'll be able to launch that power.