I'm at the oasis and I've defeated all the gaurdians in the guys tomb. The 4 by 4 grid has popped up, now what am I supposed to do to open the sarcophagus?

I believe this will answer your questions:
http://www.sorcerers.net/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=001357

okay, thanks BTA.

Or maybe not, it's a pretty unexciting weapon :( .