When I first fought the elder wyrm I found it quite hard, the status attacks were too much for me, and I couldn't be bothered to set up a complex gambit system or anything.
I gave it two tries then decided I'd wander around before trying again. I went south through the Golmore Jungle, then east through the Feywood. I found myself in the Paramina Rift and walked up to Mt. Bur-Omisace, then realised that I had just skipped a storyline boss!
I decided to leave it for most of the game and then take my revenge by beating him just before going to fight Vayne. I was on level 70 or so and he went down like a fly!
Just wondering if I'm the only person who couldn't be bothered to fight him . . . there must be more lazy people like me out there!