Here a list with the slayermasters, and the locations.
Also i listed what tasks you can get.
Mazchna (Taverley)
- Crawling Hands
- Pyrefiends
- Death Spawns
- Jelly's
- Head Mourner (Req: Combat 80 or Magic 80 or Ranged 80)
- Hill Giants
- Chaos Dwarfs
- Lesser Demons (Crystal key)
- Ice Giants
- Berserk Barbarian Spirits
- Mithril Dragons
- Skele Hellhounds (Crystal key)
- Fire Giants (Red key)
- Bloodvelds
Vannaka (Catherby) (Slayer level 50)
- Greater Demons (Crystal key)
- Black Demon (Crystal key)
- Berserk Barbarian Spirits
- Mithril Dragons
- Thzaar-Ket (Crystal key)
- Mummys (Orange Key)
- Abyssal Demons (Crystal key)
- Green Dragons
- Blue Dragons
- Gargoyles
- Bloodsvelds
- Aberrant Spectres
Duradel (Fishing Guild)
- Dad
- San Tojalon (Red Key)
- Black Knight Titan (Orange Key)
- Jungle Demon (Yellow Key)
- Black Demon (Crystal Key)
- Ungadulu
- Ice Queen
- Nechryael
- King Black Dragon (5 Dragon Bones)
- Dragannoth Prime
- Head Mourner (Req: Combat 80 or Magic 80 or Ranged 80)
- Abyssal Guardian