Is it normal that when You encounter Hecuba for the first time, and has to fight the Necromancer, He will Kill You instantly if You give him a chance?

I beat him on the third trial, I just want to know.

Yep, those guys are hard! You need pretty decent reflexes in those battles because fireballs are very quick.

The Warrior's special abilities can be pretty effective against spellcasters, so try to use them to your advantage. Can't remember exactly which abilities you have at that point but War Cry and Charge are very useful.