i believe a mix effect between giving the skill force cancel property (except invincibility period) & 7.28% additional critical rate (to the skill alone).
Tho,those fused cubes are terribly rare it seems O_o
Force Cancel: Physical Critical Rate.
Too lazy to translate, but it's most likely passive +phy crit rate & skill will behave like Force Cancel
Edit: Dammit I got ninja
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