Haleaubus in the Shurugeon Castle seems to be immune to spells and keeps blocking my swings. How do I kill this dude?

to kill haleabus you must find the five evil elements in the castle and the mask of death in the serpent temple. with these items go to the cermonial chamber in the castle. put the mask on the demonic figurine and the evil elements on the evil claws. take the mask. use the mask on haleabus and now you can kill him. beware he like flamestrike!