A wreath made of amber thorns followed by a jewel That is reminiscent of mars. The wreath will always grow leaf's that upon sprouting are on the verge of wilting. The Wreath is treated like a spirit spear and is made of fallen branches from the Sylvan Tree due to this if the wreath were to be broken or destroyed while attuned to a sylvan guardian it will repair itself or re-appear on the owners head.

While attuned to this item you can spend your bonus action to transform into an Elemental for an hour.

While in this form you sprout fiery Dragon fly wings that give you a  flying of 60ft. While in this form you gain a resistance to fire damage.

Warding Flames - whenever you deal fire damage in this form you cause a wreath of flames to wreathe you until the end of your next turn. The flames don't harm you or your possessions, and they shed a bright light out to 30 feet and dim light for an additional 30 feet. While the flames are present, any creatures within 10 feet of you takes 2D12 Fire damage and has disadvantage against hitting you with a melee attack.

Fiery Teleportation - you can spend your movement action to teleport within 120 feet of you in an unoccupied space, Then each creature within 30 feet of you must make a Dex save   (DC 16) or  take 4D8 Fire damage on a success they take half as much.

Bow of Mars - By spending your action you create a fiery bow and fire one huge arrow of pure elemental magic within 300 feet of you all creatures within a 30ft cube of that point must make a Dex save (DC 16) on a passed save they take 10d6 fire damage on a failed one not only do they take the 10d6 fire damage on each of their turns all creatures that failed the save take 5D6 fire damage and also have gain a Damage vulnerability to other fire damage you deal to them.