Ectoplasm

When cast upon a willing intelligent creature, this spell grants the being the ability to become semi-transparent and immaterial. While in this ectoplasmic state, magical weapons or weapons with certain special properties are necessary to strike the recipient. Any stealth checks such as Move Silently or Hide are made at +20%, and the character may move through materials up to 1 inch thick per level of the caster. Some materials may prevent passage such as lead, gold, or other materials with special properties (as determined by the GM). While able to move through materials and effectively weightless, the ectoplasmic being does not gain any other special movement modes like flying or levitation; walking upon materials such as water is possible though. The character in an ectoplasmic state may not make physical attacks but may cast spells that do not require physical contact. While the spell is active, the individual may choose to revert back and forth between corporeal and incorporeal forms on their turn, remaining in the chosen state until their next turn. The spell cannot be cast upon on an unwilling individual and fails completely if attempted. Likewise, unintelligent or animal intelligence creatures do not possess understanding of changing their physical state, so the spell is wasted on them.