Talk:Tear of the Goddess/@comment-86.49.82.198-20101009172103/@comment-182.55.237.11-20110504095301

actually, unique passives ONLY don't stack for the SAME item. i.e., owning two Brutalizers will NOT grant its unique passive (20 armor reduction, 10% CDR) twice. however, the Brutalizer and Youmuu's are technically 2 different items, so their unique passives CAN stack. in fact, Brutalizer + Youmuu is a pretty good combo for AD casters like Pantheon and Renekton.

that being said, the mana pool bonus from Manamune/AA/Tear is specifically tied together by the game as one bonus. IOW, you may consider this mana bonus an EXTRA UNIQUE passive. :)