Originally Posted by
Sierrahotel
I think I just found the answer.
From the Blood Angels Codex, page 23, last sentence of the first paragraph under the "Equipment" heading:
"When an item is unique, it is detailed in the relevant entry for its owner, and where an item is not unique it is detailed in the wargear section.
A good example is the Axe Mortalis, a potent weapon wielded by Commander Dante. As such, its rules are detailed in Dante's entry."
So the axe is a unique weapon, putting it under the rules for Unusual power weapons, making it AP3 and striking at Initiative.
Glaives Encarmine may or may not also fall under this rule.
They are listed in a special entry for the Sanguinary Guard. They are not detailed in the Wargear section. However, more than just the SG can wield them.