I'm (fairly) certain that Elementals aren't eligible to become Undead, considering that they're both primary Types.
Necromentals and their template would like to have a word with you.
(Earth Elemental with added Template)
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Well, I Googled example epic spells and found a spell that was "Summon Infernal Dragon" and it used keywords like "Fire" and "Chaos.".
And I'm pretty sure there are Frost Zombies somewhere. Why not a Fire or Lightning Zombie