The ingredient Scalon Fin is collected from corpses of Scalons.
7 guaranteed samples can be found, in the following locations (magenta crosses on map):
Scalon Fins are obtained from nearly all varieties of Scalons, including Diseased Scalons, Scalon Brutes, and Hulking Scalons, Mirili's Scalon, and already-dead Scalons. The only exceptions are two specific varieties found in Xaselm as part of the Rebuilding the Gatekeeper quests; these unusual Diseased Scalons and Scalon Brutes carry a wolf pelt instead of a Scalon Fin.
Scalons normally only appear in leveled lists starting at level 9 (at lower levels, Baliwogs appear instead). On boss-level lists, they can appear at level 7.
Mirili's Scalon is a non-respawning Scalon (magenta square on map), which is only present after the relevant task has been completed for the quest Taxonomy of Obsession.
The only guaranteed Scalon at all levels is (red circle):
- Xaselm has one guaranteed Scalon
Places where respawning Scalons are guaranteed starting at level 9 include (green circles/squares):