The sword used by the third apostle, SZZU. It's hilt seems to resemble a Keyblade's (a Kingdom Hearts weapon) hilt.
Like many other swords used in the BRS series, this claymore is used the same way: swinging, slashing and thrusting. This sword can produce photons which is used when charging an enemy along with CKRY.
SZZU whips her twin brother with this sword in the skill Sweet Chat, making the two a seemingly S&M couple.