You may summon your Wildfire Spirit instead of the nature spirit you would summon for the casting of Find Familiar from your Wild Companion feature, expending a spell slot or a use of Wild Shape. When you summon your Wildfire Spirit in this way, it disappears when you finish a Long Rest, rather than after 1 hour. Your Wildfire Spirit also disappears if it is reduced to 0 hit points, if you use this feature to summon the spirit again, or if you die.

In addition, you may empower your Wildfire Spirit to take on a greater form by channelling the fire than runs through your veins. As an action you may expend a spell slot to transform your Wildfire Spirit into the form of another creature for 1 minute, which must be an Elemental and have immunity to Fire Damage. The creature can have a CR up to the level of the spell slot expended, and when you use this feature you take fire damage equal to the level of the spell slot expended. Any damage your Wildfire Spirit had already taken transfers over to the new Elemental form and any damage the Elemental form takes transfers back over to your Wildfire Spirit once the transformation ends.