Probably Unsafe Alchemy

Probably Unsafe Alchemy is a Quest in Villagers & Heroes.

Aleusa wants me to bring her a leg, a mega leg.

Prerequisite
 * None

NPC
 * Aleusa B4 in Wizard School - Lab

Objectives
 * Bring Aleusa a mega leg.
 * Bring Aleusa a hollow bone.

Rewards
 * 22 silver
 * 9000 XP
 * Lightning Armor   (different depending on the played class)

Walkthrough
 * For the A Mega Leg: go kill the bounty: Megalegs and bring it to Aleusa (you can kill Megalegs and get the item before you get the quest from Aleusa).
 * Next she'll ask you to get the Hollow Head's Bone: kill the bounty Master Hollowhead, a venerable boss and bring it to Aleusa again for your reward.

Video Walkthrough (All credits go to Famar)