Fate involves defeating "Hungry Harpuia" who are attacking a group of 5 "First generation Monoceros" creatures.

Fate text tracks "Hungry harpuai defeated 5/5" but this is incorrect.

The progress bar % for this fate is tracking how many Hagry Harpuia are defeated.

The 5/5 appears to track how many "First generation Monoceros" are still alive.