[Vynd]

I don't know that you will ever have enough Death gems as Ermor. That's just a weakness you'll have to work around. There is a second level Conjuration spell called Dark Knowledge that can be used to find all of the Death magic sites ina province. You should probably use that on every province you own.

A few other general tips about Ermor:

Since your population will die soon anyway, go ahead and pillage it. Also, set taxes really high. You might as well get as much gold from them as possible.

Once all of your people are dead money will be hard to find, so save it for important things like forts, temples, labs, and powerful independent commanders. Generally speaking, don't buy independent troops (that is, non-commanders). You can't afford them and won't be able to feed them.

The best of your free units will only appear where you have temples and/or forts.

As Teleolurian said, be sure to set most of your dominion scales all of the way negative. The positive scales like Order won't help much once everyone is dead. I do recommend setting your magic scale to +3 however, because your mages are expensive and not very good at research.

Use all of the dominion points you received for taking negative scales to build a majorly powerful Pretender and to get a very high starting dominion.

Remember that your troops can go underwater early in the game when hardly anyone else can.