If fatigue was implimented perhaps it could be used to provide an achilies heel to stacks with a few uber units: throw lots of cheap units at them until they're to tierd to fight then finish them off.
TheColourOfHeartache
Giant growth spells could work by folding space in some undefined manner, from the giants perspective (and more importantly the laws of physics inside his body) he's normal size, from everyone elses point of view he's huge. Although freaky things will happen on the border: dose he hit with the strength of a giant, or the strength of a normal man devided across a larger area? I havn't really put much throught into it, just occured to me. Back to the topic of death magic, I find the ass
I really liked Dominions 3's top level summons, some of the things I think really worked. Summoning individuals, while some of top summons were interchangible units, like the Tarrasque, others like the elemental kings/queens and the demon lords were named individuals with a backstory and if they were allready summoned you couldn't get them. Summoning courts: some high level summons like the Faerie Queen broguht there servants along with them (she had 15 sprites), that was cool