A greater form of Skeleton Undead that can absorb bones to make it much stronger (and heavier). You are capable of compressing the bones to use as natural armor or carry your skeleton army with you. You can use the abilities of the absorbed (skeleton) undead as your own so long as they are inside you. Your consciousness is still within your skull.
Base Undead created are much stronger due to the grudges they carry when they were alive, and some can carry the intelligence to lead for you should you not be around. You can control nonsentient undead around you to join your army. The more grudges your army collects the stronger they get. While able to handle a bigger difference in power, without many grudges their abilities are weaker than normal.