Both boarskin and peisteskin can be caught in Mor Dhona using caddisfly larva bait bought at the Mor Dhona tools vendor next to the repair vendor. For boarskin simply go cast at the tangle, and for peisteskin catch them at norther shards (by the Porus FATE). And they both come with an 18 hour timer. Both are also 100% guaranteed from each respective location.