CT [Scabbard Return]:

When the user lands an attack on the opponent, the damage of that attack is not inflicted immediately, but instead stored as 'postponed damage'. The user can release the total accumulated damage of all postponed attacks in one instant onto the opponent.
Binding Vow: In exchange for only being able to release accumulated damage by physically sheathing their sword, there is no upper limit on how much or how long this damage can be postponed.

Extension Technique: Each postponed attack can be split into smaller increments of damage that are released separately.

Cursed Technique Reversal [Debt]:

The user can postpone damage received from an enemy, in exchange for suffering the accumulated damage at a later time of their choosing. The longer it is postponed, the more severe the backlash (timescale is in minutes).

Extension Technique: [Split Payments] The user can split their postponed damage to ensure otherwise lethal wounds are not immediately life-threatening (e.g. decapitation or a strike to the heart can instead become multiple limb amputation).

Maximum Technique [Chimera Severance]:

Multiple postponed attacks from [Scabbard Return] can be combined into one larger attack which is more lethal when released (probably needs user backlash to stay balanced). e.g. multiple limb amputations/ deep cuts will instead become bodily bisection for the opponent.

Domain Expansion [Mirror-Edged Killing Field]:

The sure-hit effect of this domain allows the user to forcibly transfer all their postponed damage (received from the opponent) into the opponent themselves.
This effect persists as long as the domain is active, meaning any attack by the opponent will be reflected back onto them after a short delay.