yes you right about how clerics hammer worked on life- it was some sort of mid combo between uncontrollable chanter pet and a swarm pet.
On EMU the second part in not codded in, so it acts like a chanter pet- guarding you
after all that's what you want if you get agro from healing or over nuking.
The proc used on the hammer pet is Hand of Order which scales with level and is UNRESISTABLE damage and 3 sec stun, unless mob is plain stun immune.
on your hammer weapon. Well there is no such spell property as dual type damage. It is possible to give a hammer 2 individual procs, but its going to be messy.
Note that if gets replaced with a regular proc (using same hand of Chaos) it will be at about 1/3rd the damage.
For now I want keep hammer like this (pending the correction of focus effects) and see how it goes.
As far as high end undead go- there are some undead in PoValor, but chances are at 60 they will eat you alive
We are currently planning a zone which would be Valor alternative, so it maybe undead related.