Strengthened Bastion grants a structure up to 20 feet resistance to all damage for the spell’s duration. Only one instance can affect a structure at a time. Casting it daily for a year makes the protection permanent.
Higher-level casting expand the protected area to 200 ft per mana upcasted.
You trace luminous runes onto the structure’s surfaces, which begin to glow intensely. A crystalline barrier forms around it, shimmering steadily. When cast at higher levels, the barrier stretches outward, expanding its protective reach dramatically.