Ankheg Culling is a quest given by Gerde in the area North of the Friendly Arm Inn. It can be done at any time, but it may be best to wait until higher levels, as killing ten ankhegs can be challenging for low-level parties. For strategies on killing them effectively, see the ankheg page. Note that it does not matter whether you go over the quota or not - there are no repercussions for doing so. Once the party has killed their quota of ten ankhegs, return to Gerde, who will reward you with 75 GP.