Thanks all, killed Bonemass in under 8 minutes with Hunter Bow and 89 Frost Arrows, chugged stam meads like a drunk. Surprisingly didn't even take the bow down to 50% durability.

PS: first use of Wishbone glitched on me, like it was detecting a tiny vein below bedrock or something. Also discovered stone golems die to a dozen obsidian arrows, lol.