Thanks for a tip. It means more points invested in Dragon Magic Focus than I have intended (Familiar seems to be a good choice of a buff anyway) but if a next attempt to play Dragon Mage fails, I will try this.
S.
Edit: I have started a new game with the Dragon Mage at a good PC. Up to now he is level 10, max Mentalism Focus. high Lore, Concentration (1 point) and Bargaining (2 or 3 points). The setup with two buffs works well, Familiar helps to fight with a staff (he uses a 1h staff + a shield) and increases damage output. At low levels the Berserk was great, but now I use my favourite way of levelling low level characters: the Via Koboldica from Western Tyr Lysia Portal to the kobolt cave under the Kobold Camp and it is not enough now, especially in the cave under Gahanka site I needed to use some health potions. Energy Blaze works well, but no miracles yet. Perhaps I should eat a few more runes for the Berserk.