[lordbosh]

My suggestion..

Magical level should heavily determine how many walls/directors you could support.

Wall/director HP also is determined by the player's magical level.

Magical walls can also require Upkeep of mana while deployed. Thus reducing the amount of spells a mage can use to defend themselves while deploying mass amounts of walls/directors.

Monsters and players can damage and destroy the walls/directors themselves from their source point.