The Monastery
The Monastery is one of the hardest levels to beat. First destroy the horn-blower at the entrance and then move around the perimeter of the room, taking out the legions one by one. Proceed slowly to the cliff and kill the watchman you'll find there. Free the Vikings imprisoned on the cliff and go back to the monastery. Move through the rooms, destroying the legions as quickly as possible. Eventually you'll be awarded the key. When you reach the Shaman, first destroy the glowing red poles surrounding him and then go after him directly. Take his Dragon's Amulet once he's been defeated.
Simple Attacks
Press "A" repeatedly while jumping to inflict more damage on your opponent. Note that you're also more exposed to attack while jumping. Do a single-move attack in combination with the "X" button to briefly sun a foe. Use the Thor's Hammer move -- hold "LB" while tapping "X" -- to unleash a combo attack that's both quick and powerful.
Advanced Attacks
Use the Might of Valhalla, a devastating combo move performed by holding "LB" and pressing "X" three times in quick succession. This is a Slow Rage Level 3 attack capable of breaking stone shields. To do a Valkyrie Strike, combine four attack buttons with "X" to paralyze your opponent. The Curse of Ferir is another powerful move in which you tap the "A" button while holding "LB." It can destroy multiple enemies at once and is especially effective against Berzerkers.
Other Cheats and Strategies
Use runic magic to assemble an army of over 500 Vikings. Build your army by freeing fellow Vikings along the way, then unleash a spell during a battle scene to temporarily double the number of your forces. Acquire throwing axes and flame pots to diversify your arsenal. Use Skarin's sword for fire, lightning and ice attacks in addition to jab and swipe attacks.