Where is rylands whetstone on horseisle?

Parry in Treeton has it. Just talk to him and he will give it to you to take back to Ryland.

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Before that, head up from his house to the wagon, then head west. Below the mud-hole a few steps up are two stumps, use your magnifying glass on them, then go back to Ryland, then Perry.

Improved by WhiteTulip