Some skills hovering about 30-40 for skills needed for the quest.
For combat quests like Demon Slayer, you might like to have 55+ combat level.
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You need to finish a of the quests, members and non members. and you need to have 99k to buy it off the wise old man
A Diving apparatus and Fishbowl helmet are needed. Keep in mind you can't just go underwater anywhere, only in certain quests.
You will need to complete the quests before it.
The quest is Recipe for Diaster (RFD). You must save one of the people there. To finish it you need 175 QPs, but you can start it now. And get your hell cat/kitten.
Heaps. iT takes 4000 hours of work to get to level 99 in all skills (according to runescape)