There are a lot of misconception about the Liches here as very few adventures and soldiers have come back fom battles with them. First off not all of them are spellcasters. A small amount of them are warlords w 10-10,000 followers although the vast majority are mages. They start as low as 3rd level and range up to 15th. The lower level ones are not taken care of by the high level ones. AS long as they stay out oof the way they are tolerated. About 1/2 of them are static, that is they can't change their spells and they cannot advance in level, but the other half can do both. The ultimate mysteries are : Where did they all come from? and How are they able to be so organized for egotistical mages.
Nearly all of them have special power, even to the point of having very significant melee attacks for example.
Some examples of ll of this will(eventually) follow.
Saying YES whenever you can(as long as it doesn't cost anything) is your job as DM.
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