[Shovah32]

MA Ermor is my favourite for communion. Suddenly all your little thaumaturgs are casting darkness, spamming skeletons and causing havoc with terror, drain life, shadow blast and boosted nether darts all by themselves.

Your 3 questions have been covered. As for number 4? My advice would be: think big. For example, if you are playing MA Ermor try to get 8-16 slaves for a 3-4 level increase in death magic(up to 4-5), astral magic(same) and holy level(up to 5-6). With darkness and power of the unholy sepulchre your reanimated undead are not only meatshields - they are faster and more skilled than the enemy! Once that is up, a bunch of level 4-5 masters spamming nether darts and terror(or drain life on high MR unroutables/wither bones on enemy undead) can demolish anything your now 'elite' undead can't handle.