Valhalla Ruin is a guild dungeon that can only be enter by fellow guild members. Every guild member who wants to enter Valhalla Ruin certainly needs 40 Silver Badge to open 1 Valhalla Ruin portal. Only requires 40 Silver Badge and Valhalla Ruin Portal will open for 1 week before resetting again.
Valhalla Ruin has a total of 5 Mini / MVPs. Kill this Mini / MVP to get the loot from the Mini / MVP, but if you have finished all Mini / MVPs in Valhalla Ruin, of course you can still enter Valhalla Ruin to help your guild members and get Friendship Proof and Guild Contribution prizes.