"The Three Brothers" renamed?

I have read that a good gladiator pet to farm for rank 4 is one called The Three Brothers, which is legendary and cost 80 T3 tokens in the reliquary. I don’t see that pet in there. But I do see one called Risen Guardians - are those the same thing?

Yes, the risen guardians are the 3 brothers. The pet always had the name risen guardians iirc and were only called 3 brothers due to the t3-quest at which you have to kill the 1st bossgroup at Thoth-Amons stronghold.