Eiame's Fiery Vortex

A howling vortex of flame appears centred in a 10' radius space ("vortex inner radius") that you can see within range at ground level. When it first appears, every creature within a 30' radius of the centre of the vortex must succeed on a Strength saving throw or fall prone. Any creatures within the vortex inner radius fall prone and do not get a save.

The vortex exerts a force, pulling all within a 30' radius toward it. Until the spell ends, that area is difficult terrain, and any creature that starts its turn there must succeed on a Strength saving throw or fall prone and be dragged 10' toward the centre. A creature failing their saving throw while within the vortex inner radius is dragged to the exact middle of the effect and is unable to move that turn.

Any creature ending their turn within the vortex inner radius falls prone and takes 2d6 fire damage.

This spell has no effect on creatures that are in flight at a height of 10' or higher, as this spell's effects are lateral, not spherical. If they are flying under 10', when they fail their save they are grounded and are subject to all the other spell effects.

Fire Damage Amplification. Any fire damage spell that applies its area of effect within the vortex inner radius, in full or in part, adds 2d6 to its damage roll as the vortex contributes its fury.

At Higher Levels. For every spell level above 3rd, the outer effect radius grows by 5'. The vortex inner radius is always one-third of the outer radius, rounded down, and causes 1d6 fire damage per 5' of radius. (15' and 3d6 at level 6, 20' and 4d6 at level 9.) Fire damage amplification increases to 3d6 at level 6, and 4d6 at level 9.