Thread:BlissFrontier/@comment-22439-20150307085519/@comment-5007614-20150408071612

Similar skills from "similar sources" do not stack - they get replaced by the later buff. "Similar sources" are like BB/SBB, item effects, sphere effects, etc. The only exception is that two Leader Skills will work.

In your example, Nick's SBB will replace Aem's SBB's BC drop rate. However, it will stack with BC drop rate gained from a sphere, a consumable item that gives temporary BC drop rate, and from two different leader skills that affect BC drop rate.

Don't quote me as I may be wrong, but that's my understanding.