WoE Supplier
From HeRO Wiki
A WoE Supplier will give out consumables for 1 zeny to allow everyone to fight to their heart's content in WoE! You can find him in Prontera, Geffen, Aldebaran, Payon, Yuno, Rachel, Carandel and Kaldheim near the other crucial NPCs.
Note that these items can only be used inside WoE Castles and Battlegrounds.