Derwin has moved on to Hamelin in search of more creature data.
This errand is available to complete after completing Errand 071.
Derwin the researcher can be found next to the Cat's Cradle in Hamelin, and he requires Tin-Man, Sprog Cog and Clinketyclank. Unfortunately, the chances of catching them are not good; 6 to 8%. You'll have to fight MANY battles before finally having caught the three familiars Derwin requires. When you finally do, return to him with all of them in your party or reserves.