The Dink Network

I've finally beaten the final elemental knight and want to make the ultimate weapon but haven't got Gimac's weapon.Where do I find this?
Help please!

Kill slayers, stone golems, dragons, talk to wells, and you could randomly get one.

Thanks for that.Is that only on Odvi or do I need to go back to every island.

Its random, so any type of slayer, stone giant, etc. may drop one.