Conifer Strobilus

The druid taps into the natural energies of the pine cone, spreading its presence to a large area around themselves, their allies, and their foes.

Any target who the caster perceives as an ally will be protected by the pine's resistance to fire, gaining fire resistance for the duration of the spell.

Any target who the caster perceives as an enemy will gain the pine tree's weakness, suffering from weakness to fire for the duration of the spell.

Using a spell slot of 2nd Level or higher:

Targets perceived as enemies will take 1d2 fire damage (+ the caster's spellcasting ability modifier) per turn until the spell ends, and spell duration is increased by 2 turns.

Using a spell slot of 3rd Level or higher:

Targets perceived as allies take no fire damage, instead being healed 1d4 HP (+ the caster's spellcasting ability modifier) per turn until the spell ends, so long as they are on fire. 

This aspect of the spell has no effect on Undead or Constructs.