lens+, combis, skill awakening in your top (will loose 10% ele resis but will stil have like 78%, enough for flame bears) realm bracers etc...Staff lvl 20-29 elite full water lvl 5 np.
In my experience i notice that the best level to drop shuta is 28 though you can drop it from 20 to 33...Dropped 2 times at 28, never at other level (with many chars)
If your char is from level 24 to 27 = candle bears
If 28 or 29 = flame bears
I think that candle bears have higher chance to drop it in webzen's version. But I could be wrong.
On the other hand, there is 1 spot with 6 candle bears, and other spots with 3-4.
But there is a very large spot with flame bears, if you are strong enough and spot is free from noobs, you can take all flame bears (more than 10). More bears killed in less time = higher chance to find the ring fast. And there is another, small spot with flame bears near tullan.