Runewall

Runewall is a block that has many varieties. These blocks are only spawned in structure generation and cannot be used by players. They are used to block progress until a certain boss is defeated or a condition has been met.

There are 4 types of Runewall,
 * Pre-Hardmode Runewall that will disappear when the world becomes Hardmode,
 * Mech-boss runewall that will disappear after one mechanical boss is defeated
 * Plantera runewall that will only disappear when Plantera is defeated
 * Moon-Lord runewall that will only disappear when the Moon Lord is defeated.