It is WOE-based as woe damage reduction already takes place whenever koe is activated. It has always been like that since. Just that, the Emperium is WOE FE-based (Holy). Not plant based (1 damage). Here’s the mapflag info.
BG/KOE/PVP Consumables Seller NPC is temporarily available in Prontera. You can temporarily purchase it via zeny, instead of war badges. the reduction is only 70-80% than the original tool-dealer counterpart. I only added items that can also be purchased in regular Tool Dealer npc. I could not lessen this price further as I’m not sure the effect it may cause once I transition this shop buyable with badges only, not zeny.
Items listed before Discount. 30pcs each box. Weight reduced by -50% effective immediately. but to change item description, it needed a patch (during maintenance)