This mod adds a few variations of bedrock you can use for making secure areas in a map or survival world.
Bedrockium Air: Visible in Creative mode, invisible in survival mode. Useful for invisible barriers and the like. Note: Survival players can interact with blocks beyond the air, so plan accordingly.
Bedrockium ____: These blocks are a lightweight version of some of the more common vanilla Minecraft blocks. Since this is just a regular block, you can use these for huge areas of your world.
Bedrock: This block is a "paintable" version of bedrock. Right click with nearly any block to set, and with an empty hand to clear.