秋の落ち葉 (Aki no ochiba) – 年の初炎 (Toshi no hatsu honō). A ritualistic performance held by the dragon-kin usually during the period when a new year is arriving. The ritual serves as both a morale booster for the fire dragon-kin and a sort of spirit-replenishing custom. The performance is often held by heads of each clans, and has two sequence : The first sequence: Fu or Closing, symbolize the ending and tranquility of the current year as it comes to a close, while the second sequence: Qi or Open, symbolize the arrival of the year that follows with a display of roaring flame, with an eye to remind every members of the community to start the year with as much passion and fever as the flame in which they bathed. Additionally, it also serves as an opportunity for members to show off their prowess to other members by enduring the scorching heat until the flame is snuffed by the mountains winds.

• 「封 Fū - Closing」– The caster calls forth the fallen leaves of Autumn and Winter using the winds, during this sequence, leaves ride the winds to the battlefield and those that made it to the ground layer an area of 60 FT around the caster in multiple layers of golden-brown leaves, while others float gently down from the skies once the winds are gone, leaving behind a serene and perhaps tranquil resemblance of fall... This sequence cost an action and a spell slot; additionally, everything within the field of leaves have disadvantage on Stealth checks due to the crackle of the leaves, even if they're flying unless their flight doesn't leave behind small gusts or puffs of air that will disturb the field.
  

• 「启 Qǐ - Open」– Fire is set to the leaves beneath, turning the once tranquil scenery to a living furnace. Roaring flames engulf the ground, the air itself 'cracks' as flame embraces everything within the 60 FT radius AoE. For an undefined duration (So long as the flame is still roaring, and hasn't been snuffed out), the AoE is regarded as difficult terrains for everything that lacks Fire resistance or immunity, or at least 20 Constitution scores; and the AoE continuously apply burn stacks for each turns spent standing or flying (by 45 FT high) in the AOE, which means any non-heat resistant entities take 1d8 Fire damage each turns, this damage is doubled if the victims are burning, dry or are overheating, this bonus doesn't stack and instead becomes a +10% Damage bonus from the 2nd fulfilled condition onward, beside that, even after leaving the affected area, one will continue to be burnt by the flame for 2 more turns before it's snuffed out automatically. Using a level 1 spell slot, The flame, regardless of how it started, is considered non-magical and thus can be manipulated using pyrokinesis for various maneuvers or to put out the flame. This sequence does not cost a spell slot and can be performed as a free action, provided that the surface below is highly flammable like the field of brown leaves.

The spell ends once all fire within the AoE is put out using any methods. but this doesn't remove the burn stacks from affected entities unless they spend a bonus action to snuff out the flame on themselves. 
At higher levels, for each spell slots higher than Level 1, the AoE is increased by 10 Ft. And the burn Damage is increased by 1d8 for every 2 spell slots higher than level 1. This spell transforms into a new variant if upcasted using a level 5 spell slot or higher. You can have this spell's variant without affecting your maximum spell counts.