Qinai's Carcanet of Bloodspiling:

The intention to use the following effect must be declared before use (attack). When the wielder character is in a war session and attacks an enemy unit (by damage their war HP stat), by any means (Combat, Spells, ect), you may sacrifice "X" amount of attribute points to increase the damage dealt by "X"d4.  When equipped in combination with the artifact The Staff of 555 Years, both artifacts are destroyed and immediately create a new, [Legendary] combined artifact: The Lesser Regalia of the 5ᵗʰ One, [Legendary] that is auto equipped.