To defeat BoneGrinder, first destroy the lightning generators with the lightning spell. It will take several hits with your spell unless Magic Level 3 is used. If you pick up Invisibility or Invulnerability spells along the way, now is a good time to use them.
To find the dragon's various powers, follow these hints:
Electricity Power: In front of Bonegrinders lair after Mesadril is dead.
Ice Power: Floating above Maultok's arena after you get Arokh.
Darkness Power: This is obtained after you defeat the two evil dragons that the traitor awakens.
Spirit Power: Appears after you defeat the Bone Dragons and the Necroman. It's outside his tower.
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Circle, Square, Right, Left, X, Triangle, Down, Up.
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Triangle, Down, Circle, Left, Square, Right, X, Up.
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Square, Triangle, Circle, X, Right, Down, Left, Up.
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Up, Down, Left, Right, Right, Left, Down, Up.
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press X, Down, Triangle, Up, Circle, Right, Square, Left.
When you are in a sky battle, make sure you are targeted on one of the dragons. To dodge easily, make sure you are hitting X and triangle, as well as, left and right.
As you go through Shadowmire, you will come across some Trogs that have staffs that shoot electricity. When you come to that part, in order to avoid getting hit by the electric beam, press the X button and roll over to the Trog with the staff then stand upright and start slashing it with your sword. That should take care of it.
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