I just had an idea.
If this is still all/all (and I do remember equipping my Cleric with this at one point) does that mean that a Berzerker can equip this to raise his piercing skill?
(This is assuming though that Piercing and 2H Piercing work off the same "piercing" skill. And assuming that a 24 delay is as slow a piercing you could get for a zerker.)