The Hidden Forest

Do the Frostcrypt instances set as you go in even if youve been in previously on another level? Or does it lock until it times out?

I went in on T6 and was clearing too slowly for zone respawns, so i went out and went in again at T3... except they were definitely T6 mobs.

I'm guessing there's a 24 hour reset the same as other instances?

Its a shared instance with respawn times, so i doubt it reset.

They're separate instances so you can come out and go into another tier and it will be a separate instance with different scaled mobs on their own spawn timers. Kryol in Valdeholm gives insights into how the mobs in the zone work.