UPDATE: We’ve separated the inventory between Factions and Peaceful. This means you cannot move items between the two worlds. When you go from Peaceful to Factions, you’ll have your Factions items in your inventory. When you go back to Peaceful, you’ll have your Peaceful items in your inventory.
If you happen to have a Bedrock in a chest in Factions, you’ll need an Owner to move that over to the Peaceful world for you, because it’s useless in Factions!
There is now a small shop for Factions at /warp FShop.