Spriggan's Thorns is a medium armor set. The 5-piece set bonus adds 3450 Physical Penetration.
This set is the Stamina equivalent of the Spinner's Garment set.
Spriggan's Thorn is part of the base game and drops in Bangkorai in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire medium armor, jewelry and weapons for this set in the Wood Elf motif style.