Teleport Stone farming: Go to The Yensa Sandsea and fight Urutan-Yensa on the tower platforms. Once you get a good chain going, they’ll drop lots of Teleport Stones among other things.
Zalera Battle (Barheim Passage – Optional Esper): Level 49 is best for this fight as it’s not a multiple of 2, 3, 4, or 5 and it’s not prime, so none of his AOE spells work, including Prime Lv. Death, which is a nightmare when you have only five minutes before he kicks you out making you have to start over.
Force Enemy Respawn: Move two zones away before returning. You can also (sometimes) trick the engine by using a different entrance to make it think you’re in a different zone.
Max HP: Your max HP can break the traditional 9999 cap, but the display will only show “9999”. Why? I have no clue, but you can only achieve this with Bubble (Doubles max HP) or Infuse (Consumer caster’s HP to change target’s HP to 10x that amount). *Assuming Infuse works that way, I’ve never used it. Infuse doesn’t work that way.