What are the odds on the extremely rare, super rare, very rare, and rare drops

Always random.

what those really rare ones that no ones ever got?

ty Risen

well its not actually random, they do have drop rates and everything is relative, the famous one (and only one jagex has disclosed) is that a left half shield is 40 times as rare as a half key.

lol i had my first basilisk task and straight away it dropped a half key, lil later gold mystic hat and later a rune dagger, so i guess its random

Always random.

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Of course it is random, but EVERY time you kill a monster, you have the SAME chance to get a certain item. You have the same chance to get a dragon chain on your 1st and 350,000,000th dust devil. The chance maybe is 1/10,000, but that doesn't mean it's enough to kill 10k dusties. It means that every time you kill a dusty, the game will roll a dice with 10k sides, of which one is a dragon chain, maybe 5000 are just coins, and lower numbers for rarer items.

 

 

 

All drops are random, BUT some are more likely than others

extremely rare, super rare, very rare, and rare.

 

 

 

 

 

You awnsered your own question.

If you fight the Kalphite Queen 100 time after each other, you might end up with 100 dragon chains.

 

It possible, not very likely to happen, but possible