i just fished here and he passed by and attacked me. first some skeleton roamed there and my pet killed em, after they attacked me, while if fished there. i was about 30mins there, before Dwigas Lowater apears and droped this item.
the locs are:
neg558.64, neg640.49, -1.38
right next to the aviak monument.
i hope this helps abit.
best wishes to all oldworld fans!