right now im taking cave keys as reward. i have 3 characters with everything lv4 ( for the cave items) and one character with everything level 4 except combo all lv3 plus have some lv 5's but only 2 or 3.
the best choice for now is to keep on getting cave keys till i have the runes lv 5 or higher? and than take coupons? or cave keys is always the best choice even if you have them lv 6 or more?
Always take the keys, always.
I know you will suffer diminishing return from key-rune as you level up. But fact of the matter is, so would everything else. So while you should, at some point, stop spending coupon on cave/key, farming it off the tree will pretty much always give a good return on investment comparing to other aspects.
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