Board Thread:Versus Battles/@comment-27574279-20190812020917/@comment-27574279-20190812055209

(only that it does boost it), it boosting skill at all due to it saying "bloodthirsty" which made me think more of rage, which would result in much less skill, And I did not find Griffon being casual (which doesn't really matter anyway). Muramasa boosted Zephyr from a 9-B to a 7-C when he was trying to save Gale.

Muramasa is bloodthirsty, but it's not a berserker. It's clearly shown that it can act rationally and hold conversations with Zephyr, but it also enjoys killing.

You'd be surprised at how much damage a sword can cause if it can cut anything.