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.
Dragon Power Locations
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.
Extra Money
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Circle, Square, Right, Left, X, Triangle, Down, Up.
Full Health
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Triangle, Down, Circle, Left, Square, Right, X, Up.
Increase Level By One
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Square, Triangle, Circle, X, Right, Down, Left, Up.
Increase One Spell Level
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press Up, Down, Left, Right, Right, Left, Down, Up.
Invincibility
During gameplay, hold L1 + R2 + L2 + R1 (in that order) and press X, Down, Triangle, Up, Circle, Right, Square, Left.
Sky Battle
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.
Through Shadowmire
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.
BoneGrinder...