Where is the last griffon?

I’m farming griffon cards, and I only need one left to complete de set, but I still haven’t encountered that last griffon (Griffon Veteran). I’m currently RD 390, idk if it appears after that, so if someone has any information about this, i’d appreciate it

Last griffon is in the life guild, a reward unlocked for beating false gods once you get guilds (wanna say its after your 2nd round of nether bosses around 420ish)

Ho I see, thanks !