I've gone through DLC on NG++, STR build, full heavy armour (100 lvl). Those ghosts were also pain in the a** for me, but fought them 1 on 1, using mostly rogue stab ability (great cause it's knocking opponent down on last hit), lightning mace (orange version of the weapon dro...
He will probably take the corpses of some of the fallen giants and turn them into more runeslaves to protect him in his lair and to stand guard on the library level. He will probably also get some of the giants above ground to come down into the main cave level as added security. I...