Block strengths table In United Factions everything is raidable. There are no unraidable bases. However there are blocks that can make raiding a little harder for an attacker / enemy. This is the table and amount of blasts it takes to blow up a wall fortified with these materials. Block Type Amount of TNT shots Further info Any type of brick block, stonebrick etc. 2 This includes stone brick, decorated bricks etc. Any type of concrete block 3 This includes any colour of concrete blocks. Bricks 5 Bricks are quite sturdy against TNT Obsidian 25 Yep obsidian, almost indestructible but not impossible! Crying Obsidian 40 Crying obsidian, the strongest material after bedrock! Visualization of defensive bricks: