We've also now datamined the Fyrakk Encounter Arena and additional effects and assets related to the encounter! Spoilers ahead.
Here's an early look at the Fyrakk Encounter Arena, however some assets are currently missing due to datamining when compared to the press image.
One of the wipe conditions on the Fyrakk encounter is Amirdrassil Burns when the tree burns. We've found this spell animation which seems to indicate that the entire encounter platform will indeed burn when players wipe due to this mechanic.
There's also a flower with various versions of being burned likely the missing asset from the Encounter Arena above.