Phoenix' Fire Spirits, when launched towards lower ground elevation, will travel downwards visually. But they will reach the targeted area as if it was on the same ground level as Phoenix, so before theprojectile visually reaches the target area. Also, the explosion effect is playing on Phoenix's ground level, too, so it hovers in the air.

1. Pick Phoenix and level up Fire Spirits
2. Move onto a cliff
3. Cast and launch fire spirits onto lower ground
4. Observe the projectile and the timing of it reaching the area

Result: The effects reach the area before the projectile does. The particle effects of the explosion are floating in the air

Expected: The travel time of the effect should consider Phoenix' ground level. Alternatively, make the fire spirits speed consider the height. Also, the explosion effect should be on the ground, not in the air.