Phantoms from other Worlds!

No, it's not the title of a new book, if you were wondering! xD
Btw, I would like to know how much visible is an invisible phantom (under the effect of the Invisibility spell) and if phantoms could be hurted by "things" of another world (fall damage included).
Thanks!

what do you mean? lol

invading or summoned phantoms can be hurt by fall damage, traps (like the boulders and arrow traps in sens as well as the swinging axes), summoned phantoms can be hurt by regular enemies while invaders are immune, except in the case of the hellkite dragon on the parish bridge which can one shot most enemy phantoms (though you have to trigger the dragon)