Knighty Nite Achievement in Guardian Heroes

To fight Valgar you need to make choices 3,2,5,3,2

At the start of the match hit  and then  5 times. This will select berserk mode for the undead warrior. Just hit again to set him in this mode for this fight (putting the undead warrior in berserk mode). Press  to block when needed, but you can easily get hits or combos in on him. He usually just concentrates on the undead warrior which makes him very easy to attack from behind. If your health gets low just defend and the undead warrior will kill him quickly. This is a good boss to path and final boss to do hard mode on.