A devastating shower of meteors will rain down on the enemies in the target area and smash them to the ground. It will be possible to enhance this spell to include a huge meteor that will inflict heavy damage upon impact.
An effective use of Incendiary Shower would be to use it in conjunction with a stunning or slowing Combat Art like Shadow Step or Frost Flare. This can potentially allow the elf to forgo the stunning mod and choose more fire damage.
Choosing both damage mods gives the additional benefit that each meteor will do more damage. As not all the meteors will hit small size (normal) mobs, the more damage each meteor does the better if you plan to use it to kill normal mobs in addition to bosses.
For hitting non-boss monsters more easily, the faster falling mod is very good.
In order to improve the chance to hit target (non-boss) enemy the High Elf should target the ground in front of the approaching enemy. Timing is key and if timed well the enemy will run into the stream of meteors as they land.
Slow-moving enemies, such as zombies, can be targeted directly. The circle will show centered on where you first click, but the meteors will fall on where the enemy currently stands when they begin to first fall.
Items with bonuses to Combat Art Range will increase the area of effect. This may be counterproductive for attempting to hit smaller targets however, as the meteors will have larger empty spaces between where they hit.
Pros and Cons
Multi-hit attack that can smoke multiple enemies, or hit a big one and finish him off in one spell.