While I was playing x-world and was trying to achieve 99 slayer some monsters I had no clue where they are! here are the ones that i've been assigned with and found.
Hellhounds ; at the end of Lucien's dungeon click floor trap near the ladder and go right.
Black demons ; past the dragons in Lucien's dungeon just bit further on from chaos dwarfs.
Blue Dragons ; Lucien's dungeon (use the agility pipe right next to the ladder)
Baby Blue Dragons ; Lucien's dungeon (use the agility pipe right next to the ladder)
Giant Bats ; Lucien's dungeon walk past the agility pipe all the way through until you notice the ghosts, look on the map for a big area.
Lesser Demons ; Lucien's dungeon. Head straight through past ghosts chaos druids and you should see them behind a fence.
Hill Giants ; Lucien's dungeon. Just before black knights underground base.
Green Dragons ; Wilderness level 19 wild near dark knight castle.
Ice Warriors ; level 50+ wild on the ice mountains near agility area.
Dust devils ; 2nd floor of the slayer tower
Crawling hands ; 1st floor of the slayer tower
Gargoyles ; 3rd floor of the slayer tower
Bloodvelds ; 2nd floor of the slayer tower
Banshee ; 1st floor of the slayer tower
Dark beasts ; Black knight underground base/ 3rd floor of the slayer tower.
Abyssal Demons ; 3rd floor of the slayer tower.
Rock crabs ; speak to Town crier to be transported there.
Unknown - Ice Strykewyrms ,
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Well thats all I learnt, have any other slayer tasks assignments that needs to be here? post =D