Not currently. Probably an oversight
It’s a heat magic by game standards. Don’t think too deep about it
Blue urchin spines can be brewed into slowness potions
Charred. If you’re asking why it doesn’t produce steam when imbued with water it’s either forgotten about (like scald dagger) or Aether Lightning + Water != Steam, I lean towards the latter
PTD doesn’t produce poison fumes, it’s a poisonous tooth taken from a poisonous shark.