Hey, nice spell there, but i think it's different from a wall...i mean, a X shaped thing that slows enemies and does damage, it sounds more like a trap to me. Enemies can't go through it, so it's a wall...i don't think so.
Oh another thing, according to myself, attacks shouldn't be possible if there's a wall in the middle of the "attackers". I'm poiting this out cause i could attack a enemie through the wall(melee attack).