Yes, completely immune to Dragonfire. OP as fuck and not needed Rather not see any of the extreme potions in OSRS. Super Antifires were.
Obtained From: Herblore; Players. Notes: Anti-fire breath potions require one lantadyme herb, one dragon scale dust and level 69 herblore to.
Use Dragonfire potion + Dragonfire shield ~> Dragonfire shield . That is not something OSRS needs and it would just make dragons far easier.