I think the customer support reply is preety clear, requires a melee weapon equiped but the warlord doesn't need to be by the monster, the target ally does.
As far as resistances it doesn't say in the main description and i also can't seem to find an example one way or the other. Until something says otherwise They Don't Stack, althought if you could find a CS report saying one way or the idea it would be ideal.
Manlich being a creature of the night, often has undead creatures working and fighting for him. At one point nearly 6 months ago you nearly had Manlich routed but he recovered with a small army of wights and ghouls from out of no where. Althought for the most part these forces have since been destoryed their are still more than a few wights arround.
Manlich was also using cults and mercenaries to bolster his forces. The cults he uses are notible for their strong colouring, often purple and or gold. These cultists are foul death worshippers of the worst kind and beyond redeeming.
The mercenaries on the other hand want only to get paid. You've already bribed/scared off any forces that you feel you could, which means that in the end anyone stupid enough to stand with Manlich will die with Manlich
Logos
~Any other questions? Hope this helps