Well. You've got Tower and Martyr. Those two need to be in for sure.

Septimus is pretty solid too - he hits hard and extends debuffs.

I'd suggest consulting Roschard the Tower (deadwoodjedi.com)  - the teams there should be a good start.

Thank  you  septumis  is  my  main  man  in  90%  of  the  game  ill  check  out  the  deadwood jedi

I see a tower and skullcrusher, they are the bones of a unkillable comp, doompriest or someone with a three turn CD block debuffs need to be on the team for it to work. Then you just add in a def down champ and a poison champion and two or three key unm and one or two key nightmare.

Speeds are very important to pull this off so it depends on the gear you have on your account pretty heavily.

My current set up with this comp is as follows

Tower 248 speed - blocks aoes
Fayne 186 speed - weaken/defense down
Occult brawler 181 speed - posions
Brogni 173 speed - block debuffs
Valk 171 speed - counter attack and stun target

The biggest down side to this comp is affinities as it really only works on void and magic, can do others with this some manual finesse but not all the way to turn 50.

The benefits is that vs void it's a easy two key unm and one key nightmare. The setup is minimal and is full auto after one turn. If you have a block debuffs champ and want to try out this comp I would suggest looking at the deadwoodjedi.com website as speeds will differ from what I listed depending on the champs you use.

I  use  tower  fully  booked  to  block  

lost  bride  to  revive  and heal  Also  does  block  buffs  fully  booked  as  well  

Elenaril  for  hp  burn  and  posion  

i  use  long  beard  for  weaken  

and  skullcrusher  for  counter  attack  he  also  has  an  unkillable  which  is  good  for  them  final  attacks  

Siphi block debuffs is a 4 turn CD booked, you need a 3 turn for what I was talking about, and you wouldn't need rez as no one ever dies. 

Do you have a grizzled jarl or brogni?

I  dont  have  either  one  sadly  but  im  sure  i  can  make  do  If  you  have  any  subs  for  the  spot  if  not  i  guess  its  time  to  go  hunting