Stallord's stuck in the sand. Give him a hand by cutting him off at the spine. As you may expect, you have to perform this task three times before defeating Stallord, however temporarily. After the first attack, it will begin to summon large numbers of skeletons when you jump off the groove and head in for your attack. You can see where they’re coming out of the ground, though, so try to slow down and pick a gap in their numbers to bust through to the spine. If you hit any of them, you’ll likely bounce around and have to come back for another pass. After the second hit, though, not only do you have to deal with the large number of skeletons on the slope, but you’ll also have to avoid the small honor guard of skeletons that appear just in front of the spine. You may have to approach at a pretty ridiculous angle to actually bypass the last group of skeletons here; try approaching obliquely (making your way down the slope while also attempting to rotate around the skeleton) or attempt to slash the zombies with your B-button attack when you get close to them. They may simply regenerate the next time you hit the groove, but it’s worth a shot!
Second Form To activate Stallord’s second form, use your spinner in the slot near his head to raise the platform. He’ll animate again and knock you off, so use your spinner to lock yourself onto the groove on the inside of the chasm that you’re in; you’ll start rising up.