Quote Originally Posted by Sove92 View Post
Back in the early days, Dhorme Chimera and the Hydra fight were not trials you could queue for. Instead you would have to trigger them in the overworld with a party member on the appropriate step. That category was there for these sort of battles, but SE turned them into DF trials shortly before 2.2, rendering the category obsolete for the next 9 years.
It seemed like they had either forgotten about it entirely or were secretly planning something for it, but apparently it wasn't the latter.