That's what I found out; if anyone have any more informations
PLEASE post here
-Aberrant Spectres require either Priest in Peril OR Smoking Kills
-Abyssal Demons require Priest in Peril from Duradel / Lapalok, not from Kuradal
-Bloodvelds require either Priest in Peril or Troll Stronghold
-Dark Beasts require Mournings End Part 2 from Duradel / Lapalok, not from Kuradal
-Goraks require either Fairytale part 2 or Troll Stronghold
-Ice Strykewyrms require Tale of the Muspah and a Fire Cape
-Mithril Dragons require enough barbarian training to access Ancient Cavern
-Spiritual mages require Troll Stronghold
-Suqahs require Lunar Diplomacy
-Terror Dogs require the Haunted Mine
-Warped Terrorbirds require the Path of Glouphrie
-Warped Tortoises require Path of Glouphrie