septimus  hits  like  a  train.  He  can  even  one  shot  spider  20  with  proper  set  up.  Even  with  decent  gear  and  some  turn  meter  controls,  you  can  get  passed  spider  20  easily.

as  for  CB,  if  i  were  you,  just  focus  on  the  gear  while  waiting  for  a  better  champion  for  CB.  

try  putting  more  defensive  stats  and  focus  more  on   kael/frozen  banshee  poisons.

and  consider  trying  bulwark,  hes  good  at  extending  debuffs.

all  the  best  mate

Septimus  is  your  best  bet  here,  you  don't need  him  for  his  big  hits  though,  build  hil  defensively  with  about  200  accuracy  so  he  has  the  best  chance  of  extending  the  posions  from  frozen  banshee.

Take  out  Kael  and  put  in  a  defensive  septimus.  Take  out  miscreated  monster  and  put  in  Sepulcher  sentinal.  Build  all  for  defense  accuracy  and  survivability.  You  will  one  key  brutal.  

I  had  a  similar  team  for  CB  and  was  able  to  2  key  nightmare.  

Your  spider  team  will  be

Mage,  miscreated,  coldheart,  septimus,  stagknight.  Depening  on  affinity  of  course  but  that  team  can  take  down  spider  20  when  built.  

tsdpool is right. Use Septimus and Sepulcher Sentinel on your team. I'm thinking you can run a speed team that goes Sepulcher lead, Frozen Banshee, Septimus, Apothecary, and Arbiter. 

yep,  i'd  love  to  see  sandlashed  survivor  in  there  too.  You're  one  lucky  pull  away  from  an  awesome  team.