Tips for making a terrifying tremere npc

Hi, I'm a new ST looking for tips on making a tremere.

The plot so far is centering on a chantry/ tremere whi still makes cast gargoyles.

I've never made or played with tremere at all so some tips would be very helpful! The gargoyles are a mix strength with the strongest being around 400 xp (it's a pbp server) and the lowest around 60 - 80exp i think?

I'm also thinking of making a Tzimisce as a secondary and slightly stronger then the tremere but I know how to make tzims.