Hi Ronin, it depends what area of the game you want to improve at. You have a nice roster. I'd probably go with Candraphon.

This "f2p" account would put many paying account to shame...

I  think  Doompriest  or  Rector  Drath  as  they  are  both  great  supports  for  dungeons,  faction  wars,  and  doom  tower.

This "f2p" account had so much luck they might as well as have won the lottery twice in a row

candraphon probs

And nethril!

He's a great poisoner

lol with the quotations it honestly is a f2p this past year i have just had a lot of time on my hands

Would help to know where you are in terms of progress. Sepulcher Sentinel and Rhazin are both fantastic for CB. Nethril and Candraphon are amazing for arena.

Judging from your level 60's, I would guess CB is your main area to improve. What you're mainly missing is an Ally Attack or Counter-Attack champion. I can't see any from the screenshot, but if you have one, that would be a huge priority to level. Skullcrusher is the poor man's version, with Martyr and Valkyrie being the gold standard.

unfortunately I dont have any of those my current clan boss team is sepulcher sentinal dracomorph scyl of the drakes for heals tayrel amd deacon/miscreated been toying with the last one. My arena team is Zavia Kymar Scyl and Deacon in a stun set

I'm  a  sucker  for  chicks  with  Red  Hair.  

I  say  6  star  Melga.

Based on Zavia gear in screenshot, I would focus on dungeons (and learning more about properly gearing champs).  Who is booked so far, how many books do you have?

I wouldn't use scyl in CB, MM is terrible in CB.

I would base my decision on where you are in game like Kram asked:

1. Brutal 12.3 Farmer

2. Dragon 20

3. Spider / FK / IG 20

4. NM/UNM Clan Boss

I would try and fast track Arbiter missions while arena is broken again.  

draco deacon sepulcher MM bellower apothocary and Tayrel are the only ones that are fully booked

also i posted this as i was in the process of upgrading Zavias gear

what is your dungeon progress?

IG 15

DL 20

Spiders 14

FK 16

cleared the others except force but near the end

I would consider Rector, Apothecary, Melga, Doompreist.  You have plent of firepower just need some support to carry you to the other dungeon 20s.  I see your problem with force....