The demo has been updated with many new features including starting necromancers. Each necromancer have two initial relics that encourage playing the game in a unique way.
Rhal

Rhal is all about going wide and having a bunch of zombies to do you bidding. Individually they might not be very strong, but together they accomplish a lot.
Starts with:
Eye of control - Gain +2 max number of zombies.
Golden Grave - Gain 5-10 gold whenever a zombie dies.
These starting relics allow you to play around with having a lot of workers to harvest materials; and killing off your zombies in battle to gain extra gold.
Tel'tal

Tel'tal is all about magic! Cast spells to empower your zombies or curse the demons that attack your gate.
Starts with:
Diamond Wand - Gain 2 more spell charges per day
Grimoire - Provides 10 extra Energy per day.
Everyday these starting relics provide more energy and spell casts. This relieves the burden of having to be careful with your spell resources
Adjov

Adjov want to create high quality zombies, each packing a heavy punch and allowing specializtion.
Starts with:
Doctor's Bag - Increases the maximum number of parts zombies are made from by +1
Crystal Heart - Zombies gain 10 additional max health at the start of combat.
Their starting relics allows you to create zombies out of 5 parts instead of 4. Additionally Adjov's zombies are healthy and can withstand more punishment from the attacking demons.