This page will show you a few examples of container configuration for you to get inspiration
containers/container1.yml
# The plugin hasn't been tested using other container materialsmaterial:CHEST# The cooldown in seconds before an instance gets refreshedcooldown:5# The custom displayed name of the container's inventory instancesdisplay-name:"&8Rusted Chest"# The item table used to generated itemsitem-table:item_table1# Whether the container instances should despawn once (completely) lootedis-despawning:true# Prevents player from destroying this container instancesunbreakable:true# The container keys required in order to unlock this container instanceskeys:key1:2key2:1# The events of the containerevents:# Spawn living entitiesspawn-entity:trigger:ON_OPENentities:# 'mm:' to let RPGChest know it should look for a MythicMob entitymm:SkeletalKnight:1# Amounts can be a range meaning 2 to 3 zombies can spawnZOMBIE:2-3SKELETON:1# Send a message to all players aroundmessage:trigger:ON_OPEN# The radius of the messageradius:7text: - "&cA squad of undead rises from the ground!" - "&cAt arms!"