Hello again, you may still see the game version increment from time to time. Just know that these are small fixes to the Rabbit's Foot: Adventure II questline, mostly for accessibility and end of game issues arising from the world state not incrementing beyond the final boss battle.
However, 8.4.1.5 also brings about a change to all potions.
Tier I potions now restore 12.5% instead of a flat amount.
Tier II potions now restore 25% instead of a flat amount.
Tier III potions now restore 50% instead of a flat amount.
Tier IV potions now restore 100% instead of a flat amount.
Tier V Health potions now restore 100% HP and apply a 1000 point barrier.
Tier V Magick potions now restore 100% MP and apply 1/2 MP Cost until the end of the next battle, death, removal, or save cleanse.
Elixirs tier I-IV follow the same scheme as above, now also restore TP, but can only be used in battle. There remains no tier V elixir.