As a reaction, which you use when you are hit by an attack or take psychic damage, you absorb some of the incoming energy. You have resistance to psychic damage until the start of your next turn, including against the triggering damage.
If the creature who damaged you is within 10 meters it must make a Will saving throw.
On a failed save, it takes 1d10 psychic damage, and is staggered until the end of its next turn.
On a successful save, it takes half as much damage and isn’t staggered.
You can increase the damage by 2d10 for each additional mana or psi expended.