For critters....
1) Bite
2) Coven
3) Mist or Save (depends if there is a char who needs debuff attention like UB)
4) Bite II
5) Swarm and Coven II (If no mist)
6) Improved Conversion Aura I
Continue on with Coven and Bite, with a point in charm to stop TPs. Continue with improved conversion aura when there is nothing else to buy.
For Assasain
1) Bite
2) Mist if there is a need, Coven I
3) Charm
4) Bite
5) Swarm
Continue on to max bite (primary) and charm, then put 1 point in Swarm II, conversion aura and continue coven when there isn't anything else.
The main difference between the builds is one is great at pushing towers, the other is great at forcing retreat and forcing cautious play. (If the player is decent and they see a stun/bite/swarm build, they don't extend nearly as much) Espcially with Swarm II because I can pop next to them from outside of their LOS.
Items (Usually in this order)
Favor: HoB for minion build, BoTF for Assasain
Monks
Banded
Scaled
Unbreakable
Nimoth (or Hauberk for minion, then I replace banded with Nimoth, you really want that armor)
Nature's Reckoning
Plenor (Replace Scaled)
Update monks
Updated since some new people have been OMGFTFPWN Hax against my Assasin EB and item load out.