the big problem for me is Jim is sometimes using definition three:
something that covers, envelops, or conceals: the mantle of darkness.
when Eb is talking about mantle, as in the warden of DR, hes talking about the title
when Odin talks about mantle, as in santa clause, hes talking about mask or disguise he wears, an alternate self
and I dont think its possible to 'forge' mantles one and two together. they are seperate things.
I would sugest then the Term Title for definition two, and epithets or masks for definition three( which would be the propper religous term)
Athena had 74 titles, but only 14 epithets; that is entirely different names she was worshipped under, with different attributes.
Harry wore the grey
mantle of the warden
Harry bore the Title of warden of Demon Reach
Harry is the epithet of the Winter Knight
and for last case, Id just call em powers
Harry wields the power of soulfire