Double Arcane Shield this week....
Behemoth is very notable for Impervious. Also his 3rd trait can get really out of hand in a good way for you.
Emperor Khorvash's 3rd trait is one of the best IMO.
On Blue and Brown days, I have one of these two in almost every lineup.
For soul hunting I guess Pharos-Ra.
Stonehammer if you have him, great tank.