Congratulations on the 1st anniversary.
If potions are not possible,
I suggest resilience with armor attachments.
ex. common 5% / rare 10% / epic 15% / legendary 20% (PvP Only)
so Total DMG taken =
(resilience) x (block) x (ATK/AC) x DMG (roughly)
How about this?
If you think the length of the battle is going to be longer, I think you can delay the Battle-fire by 1~2 rounds