Flipinng the crab.
The crab chamera is a tough boss if you don't know how. The boss hardly will take any damage and has a very high amount of Hp. There are two ways to "flip" him over. First is to get close and use the block with the stone alchemy. Then charge your attacks and when hes about to attack use the stone spikes. He will flip over and will stay that way for some time. Then keep attacking him. The other way is to have Al guard you and then make him tackle the Crab chamera. This is a bit riskier than the first way however as Al might die. Its best to use a Fire elemental weapon on the Crab chamera. He should die quick.
Added by: ALCADIUS Jun 28th 2008, ID#30422