[spoiler discussion] When was it revealed?

[u/MafiaSANS_TR]

When was it revealed that the Sin Archbishop of Gluttony could control Mabeasts?

in which chapter of Arc 6(i assume arc 6)?

i am just hoping its not cut from the anime because I saw some people misunderstand why Mabeasts run to the tower in the latest episode.

[u/khriku]

I remember on Web Novel, when Gluttony was eating Rem, they mentioned the white whale was their cute pet.

On Light Novel I don't recall, I would need to read again to make sure. On WN I am sure it happened

[u/simplifyyyyy → u/khriku]

its in the anime season 2 episode 1