And another thing! (I just seem to come up with random stuff lately) XD
Battle Tower - I think it is a great idea, but still should be more developed (maybe a bit similar to the Overlord game where you can upgrade your Citadel change its interior and exterior etc) I think it is really nice that you can have a fortress of your own where you can retreat and rest create some stuff or even play some mini-games (which of course should be rewarding - like getting some of the Maxos powers or artefacts after comp;liting some kind of a trial or puzzle solving etc.) Arena is a nice idea too - to be able to fight some monsters (maybe even check the Necromancers work - whether the creatures he create are as strong as he tells you for example).
Crafting should be included - I want to be able to really make weapons and armour, no just enchant it (especially if I have the best smith in Aleroth!).
Summoning should be more diversed - why cant we summon some wild animals or other creatures except for demon, spirit and undead.
Also some strategic component (as a minigame) could be included - for example somebody attacks your tower and you need to defend it - you can use you necromancers powers to summon zombies and other undead (by the way - zombies should be scary and look like dead people and not only as some strange constructs with pickaxes instead of arms - but this is interesting too) etc... Hope you got my idea.