6th? There are only 3. I don't find Zerrikanterment useful either, but I favor Deithwen over Addan Deith; damage against gargoyles and large monsters is important in Act 3.
Sorry my bad i meant in the first one, the one near the elf girl that can grow a beard.
Besides what will you do with the sword after you finish the gargoyle contract and there will be no more of them?
Oh yeah, there are 6 gargoyles at that one. But only 3 different chambers.
Anyway, there is a large monster still to be fought...