Creates a crystal on the selected area of the battlefield, which blocks the path until it is destroyed or the battle ends. The crystal has 1 HP and Defense = 0. When destroyed, it explodes, dealing damage to all units on adjacent cells.
Effect at levels:
[None]: damage = 40 + 8 * SP
[Basic]: damage = 60 + 12 * SP
[Advanced]: damage = 80 + 16 * SP
[Expert]: damage = 100 + 20 * SP

Raises a wall three cells long on the selected area of the battlefield. The wall receives only 25% damage from ranged and magical attacks. The attacker in melee combat receives physical damage equal to the number of health points lost. Each cell of this 3-cell wall is considered an independent creature with its own health points.
Effect at levels:
[None]: Health (HP) = 20 + 5 * SP
[Basic]: Health (HP) = 40 + 8 * SP
[Advanced]: Health (HP) = 60 + 10 * SP
[Expert]: Health (HP) = 96 + 12 * SP