Funny, how most played race are Undead, but Lichlord did not get any votes.
Common, which class is more bad-ass than Lichlord?
Azrael's Faith : you get free Liche or Cultist from time to time!
Phylactery: your hero becomes friggin IMMORTAL!
Magery: meh, but not bad (better than nothing...)
Chronomancy: guess what's the greatest weakness of undead...yeah, speed...GUESS what Chronomancy can fix for ya!
Mage King: THIS IS IT! This is probably the best skill, worth investing in. Honestly. No other XP boosting skill gives +3 XP per point...not to mention that spell casters give double bonus in return - not only the spellcaster will be stronger, but will summon/cast stronger units/spells!
Shadow Strenght : Meh, but every hero needs a skill to ignore, to have more points to spend.
Witch Hunter: probably same as above, but I would invest few points here, enemy spellcasters are best brought to graves early!
EDIT: Elemental Lore gives +4XP for Elementals, which confuses me, as only produced units shall be rewarded by this bonus, not summoned. Hence my confusion, as I am not sure there is a race that produces elementals (instead summoning them, like Dwarven rune master or Swarm Priest.. )