
CryosFirerush |

I'm looking for advice to create an level 30 lich necromancer for an epic campaign I plan on running to act as one of the high end bosses for the end of a storyline in the campaign. For anyone who knows what I'm talking about this character is supposed to be Mol-Tet from the Tome of Artifacts from 3.5 DnD who was human but was killed when one of his undead army creating artifacts turned on him with the idea that he found a way to become a lich after death.
After looking around at "best class for necromancer" I'm still unsure how to go about this, so far my outline for the character is a Wizard (Necromancer)10/Cleric 10/Mystic Thuerge 10 with the Mythic Lich template but I'm looking for more suggestions, both in terms of base and prestige class choices, as well as feats that might be useful.
One thing of note here is that this character, Mol-Tet, does possess a minor artifact that allows them to control any number of undead, essentially removing the need for feats and class features that increase the number of HD of undead that can be controlled at any given time.

CryosFirerush |

Instead of 10 levels from each class you could just do a Gestalt Wizard/Cleric 20 and add the mythic template.
I suppose that could work, I'm already using gestalt to make a truly overpowered villain for another storyline, but I suppose ancient necromancer lichs can bend the rules a bit compared to PCs. This is a Epic Campaign though so I do want at least 25 levels plus the mystic theurge's ability to cast two spells at once can make for a devastating boss fight, with meteor swarm and implosion both being used at once.
While I do appreciate the comment regarding undead master (might take it as a filler feat once I pick all the ones that will make a difference in an actual fight) it might be unnecceesary since part of his lore is that Mol-tet created magical artifacts to mass produce his undead hordes for him. "The altar of the bone citadel" that animates skeletons to built a giant tower of bone for him to serve as a lair and "the ebony skeleton of Mol-tet" that animates and drives a horde of skeletons and zombies to kill everything in their way. The ebony skeleton is what killed him the first time since he forgot to exclude himself from the skeleton's "kill anything living" effect

The Sword |

I would keep it to one class and maybe add prestige levels, a prestige class from 3.5 like the archmage or mythic tiers. At that power level it doesn't really matter at what point spells come online and artefacts can make up for any shortfall that a cleric has over a wizard. At that point quality of powers will matter much more than quantity.
If you want to make him more interest go down the experimental route and give him the school powers of transmutation and necromancy to represent his attempts to enhance and improve his undead minions.
As well as having many undead minions in stasis or waiting ready to aid him, he could also have hanging spells - like spell triggers to overcome the round per level limitations. Perhaps give him some kind of undead construct mount or palanquin that he has crafted a that protects him or gives him cover/defences. The PCs then need to defeat the mount before gaining access to him.

Morganstern |

Maybe do him up as a Wizard 9/Cleric 9/Mystic Theurge 10, use traits or Fame boons to boost his spellcaster level up to where you need it (I believe the one I'm thinking of is called Ecclectic Training, but not sure). Then use the other 2 CR to add 4 tiers of mythic (Dual Path for Archmage and Heirophant) to really boost him up.
Add a contingent spell on him to cast Harm on himself (possibly maximized or empowered, or both) if he is below 2/3 hp, and you have a suitably epic fight on your hands.
Another idea would be to have constructs that act as "birthing pods" for powerful undead in the room, each one immune to magic and made of Adamantine, that can be disabled to stop them from spawning more minions every 1d3 rounds.