Originally Posted by Lerusarion
Baldur's Gate 2 - Irenicus Dungeon (Ok, not Obsidian. Still counts)
Black Isle (from which Obsidian partially descends) was the publisher
of the BG games (and even then purely as a marketing label of Interplay). They were developed
by Bioware. So no, it doesn't count. The only IE games that Black Isle developed were Torment and Icewind Dale 1 & 2.