Was trying out Horrid Wilting in the brawling pit (due to lower than expected damage) and came to find a couple of important facts about this spell.
1. It is a WATER spell (not damage type--that is un-typed--but classification, which affects savant enhancements).
Thanks for not letting us in on that Turbine. Nowhere is that documented. I'm a part Fire Savant (4 Core levels) and at level 16 I was casting it as if I were a puny 12th level caster due to the penalties of casting a spell in a school opposing my expertise. I would still use this spell, as the damage is un-typed and boosted by impulse, but at a much later level to avoid being gimped by the loss of levels I suffer in casting it. If you're a Water Savant, yea for you; this spell's level and max level will be boosted for you, and provides a nice bit of force damage to more than 1 target at a time. If you're a Fire Savant I'd wait till you are level 26 - far far away for me ATM.
2. There is still a targeting bug, and a nasty one.
My play style has me using auto targeting much of the time. This spell does not land correctly with auto targeting. With a target clearly highlighted via auto-target, the spell emanates above (and possibly behind) the target, and the target almost never gets struck by it. When I hard target the victim, the spell properly emanates in a ring around their position. If you're the lazy auto targeting type this spell is not for you.
As with Cyclonic Blast, this targeting malfunction (or various targeting malfunctions) have been occurring for quite some time. Does anyone at Turbine actually care about making the spells WAI? This should be a very basic thing as spells are the lifeblood of casters, and as such should function flawlessly.