It's healing mace for the following reasons.
Can be used only by the 4 healing classes
If it was a generic caster weapon, would have been a staff since all casters (except paladins) can use staves, even shamans.
There is the option (which i doubt, but there is) for it to be good for a prot paladin, similarly to how Warglaives were not bad for prot warriors.
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Uord - Prot Warrior
Darkworldie - Death Knight
Tanking... srs business