When a wizard casts this spell, an outer skin of stone will move up from the ground, completely covering them. This skin is, of course, magical and will hinder the wizard in no way. The effect of this is to protect the wizard from physical attacks such as melee weapons and projectiles. For every 2 levels of the caster, an additional skin is gained upon casting. For example, a 10th-level wizard would receive 5 skins while a 20th-level wizard would receive 10. For each skin the wizard possesses, the spell will stop one attack, so a 10th-level wizard would be protected from the first 5 attacks made against them, but the 6th would affect them normally. The skins will remain on the wizard until they are affected by Dispel Magic, Remove Magic or similar spells, all of the skins are removed due to physical attacks or the spell duration expires. It is important to note that this will not protect the wizard from any magical attacks, such as Fireball.