i think 5%
if your talking about Adventure Quest Worlds, keep fighting Bone Terror until you get it!
In Battleunder (/join battleundera)
On AdventureQuest Worlds, Bone Mace is found in the museum. It cannot be purchased, rather it is a reward for the Monday Bone Mace Quest.
call 250-505-1612
You can obtain the Bone Axe in AdventureQuest Worlds by opening the Wheel of Doom and spinning for a chance to get it as a reward. Keep in mind that it is a rare drop, so you may need to spin the wheel multiple times to acquire it.
kill the skeletons at sword haven
There is no way to know the exact drop rate to anything unless your a mod but it's estimated around 1-2%
valencia in battleon. a specific day. I'm not sure which one
keep killing big black sprat i think in the grave yard
go to yulgar and then go to room 42 and Customize your skin
Battle an Undead Giant......at least that works for me
All of these items are found in the marsh, marsh2, or ruins. Hair- Dark Witch Bone- Lich Teeth- Undead Berserker