I 100% agree you can’t underestimate potions but I do know the tier 2 Gaja boss is no joke and wasn’t sure if potions were enough with my armor, not to say im stuck with the terrasteel armor but its end game armor for that mod so im assuming it should be good for end game boss fight. I was thinking about just setting up numerous beacons up with different effects instead of potions so it didn’t wear off but it goes back again im not sure if potion effects+terrasteel armor is good enough.
You could also look into incense from Botania as well. Have one for regen? I'm not sure if multiple regeneration incense sticks stack the effect or not.. I'm just getting into Botania brewing soo...