A 3x3 block that when supplied with hyperium and power, would manifest a "shield" layer over nearby damaged blocks. The hp of both the damaged block and shield would add up to the blocks full hp.
This shield wouldn't be created upon a block at full health, it would rather slowly increase in shield health until it reached its desired health.
Upon taking damage, the block would have its damage taken to the shield instead, acting as if the block wasn't damaged at all.
When the shield breaks, it would also reduce the hp of all surronding shields by 35%. This could result in chain reactions across large areas.
The barrier materializer would count as a tall part.