You can and should fear the Daemon Prince, in my opinion - apart from a TG sandwich (which he can avoid fairly easily, having flight and being able to pick them off the board in turn), there's really no way for VC to fight him efficiently. Also, Searing Doom does Flaming attacks, and the Daemon Prince has a 25-point gear allowance - say hi to the Dragonbane Gem! :tongue:
As a matter of fact, I'll go ahead and put my Daemon Prince build up here, so you guys can try and figure out how you'd go ahead and attack him:
Daemon Prince, Chaos Armor, Chaos Familiar, Charmed Shield, Daemonic Flight, Dragonbane Gem, Flaming Breath, L4 Wizard, Mark of Nurgle, Scaled Skin, Soul Feeder, Sword of Striking [Lore of Death]
So, for the unitiated, here's the synopsis of what you're looking at:
M8/WS9/BS5/S6/T5/W4/I8/A5/Ld9 statline
Flight
Monster unit type
1+ armor save
5+ Ward save (2+ against flaming)
+1 to hit
-1 to hit him
Ignores the first hit made against him on a 2+
S4 Breath Weapon with Flaming once per game
5 spells from the Lore of Death, and +1 to channeling attempts
Rolls D6 for every unsaved Wound dealt (including Thunderstomps, thanks to the latest BRB FAQ); regains a Wound for every 6 rolled
Good luck!