Valdys and Maxbt you selected the two I am currently leaning towards :)
To anser Trips question.
1. Now I have the following at 60:
Kael, Miscreated creature, Elhain, Lord shazar & Rhazin scarhide
3. I am doing approximately 4M damage at the clan boss on brutal and this is probably where I would prefer to increase the most. My clan boss team is Kael (Leader), Miscreated creature, Apothecary (lvl 50), Frozen banshee (lvl 50) & Outlaw monk (lvl 50).
4. My arena offense team is: Lord shazar (leader), Kael, Miscreated monster & Rhaxin scarhide. I am at gold IV in the arena with this team. Would be nice to try Cillian here since he is my third legendary, but I will prefer to upgrade at the clan boss first.
So my updated question is, concerning my clan boss team, who would you upgrade. Apothecary that is already on the team, or Sepulcher and add her to the team? I have read that Sepulcher should be very good at the clan boss but haven´t tried her there yet because I just got her and have her in rank 5 but haven´t levelled her to 50 yet. Maybe I try her and see if she makes a difference before I decide between her and Apothecary.