I found it was harder to find the bronze one than the rune one...so i think it must be random for everyone and theres no set ammount of tokens to get. i think in total it took me about 2.4k tokens to get the rune defender...but thats not including the other 600 tokens it took to get my other 2 :XD: so yeah about 3k tokens to get 3 rune defenders. my advice to anyone doing this is to get a mith set of armour and get 200 tokens for each trip...this is what i did as i just found it a lot faster. good luck getting your rune defender man and trust me you WILL get one. btw the silver lining to killing cyclopes for defenders is...they are proper good for training!!!(plus the armour sets are good training as well). i combined getting rune defenders with PC and it was some awesome training resulting in 82 attack, 82 strength and 81 HP :D