I don't think the Runed Oak Bow drops from the Crescent Reach bear. I've camped it many times but never seen it drop. I'm pretty sure it's only the Great Divide Bloodmaw that drops it. Runed Oak Bow dropping from a level 16 would be ludicrously OP for the little effort that went into killing it and would be better than the Bow of Blightfire that requires you to kill a level 35 to get it to drop.
Edited, Feb 13th 2021 11:29pm by animekenji