Critical Charge: When you or an ally you can see is hit with a critical hit, you charge 1 rune.
Glyph of Sabers: Whenever you deal damage, you can expend any number of charged runes as a reaction. Roll a number of d6s equal to the number of runes you expended, and increase the damage by the total to a single target.
Unstoppable: Spells that effect movement do not require concentration when you cast them on yourself only.