Tumblethorns

This spell transforms a single thorn (a sharp protuberance that has grown on any sort of plant at any time in the past, held by the priest during casting) into a whirling, flying tangle of impossibly long, flailing thorns. The ball of thorns is about 2 feet across and flies from the caster's hands straight at a single chosen creature. If the creature moves, the thorns can change direction once to follow, and strike with the caster's THAC0 +1.

The tumblethorns strike once only and are considered a nonmagical, physical attack when considering the effects of magical barriers and other spells. The spell inflicts slashing and stabbing damage equal to 1d4 points plus 1 point per level of the caster to a maximum of 1d4+10 points (half that if a successful save is made, to a minimum of 2) and then fade away. A tumblethorns does its usual damage to the wrong creature if it strikes another living creature of its own volume or larger on the way to its intended creature, but fades away harmlessly if it does not strike any living creature before reaching the limits of the spell range or after a round has passed. A tumblethorns is considered AC 3, but anyone unwise enough to strike it destroys it – and instantly receives its full damage (no saving throw).