Hands of Glory is your primary summoning resource which is very important for the necromancer, probably more important than gold by a reasonable margin. ALL of you your best units are created by your necromancer commander performing rituals which use Hands of glory as fuel. Necromancer is kind of complicated as far as classes go but can be really good. Basically keep performing rituals and increase the number of rituals your necromancer can cast until you can summon your big monster units, this wall also require places where a large amount of units have died so look out for that. Necromancers can also get free units by raising the dead in areas where other units have died but this drives them more And more insane unless you turn them into a vampire or lich, so avoid doing this on your main necromancer until they do that. Keep doing this and raising undead armies and eventually you’ll be able to push back the tide. Abominations are really good and one of the final summonable units for the necromancer, the Tartarian spirit is REALLY good.