Ice berries: +1 def for 30 sec and -5 HP. Defensive potion from ice berries: +1 def for 30 sec. Not really worth it. If it was +2 or +60 seconds, maybe.
Finished the game. Rogue with pole weapon and teleportation. Warrior with one handed weapons, attack and defense. And archer with ice, earth (earth gives regeneration, very useful) and bows and dodge. Alt-F4 when lost battles, but it was worth it.
 "Aground"){kind=icon}
 "Sword Fight"){kind=icon}
 "Wondrous Lands"){kind=icon}
 "kira"){kind=icon}
Elevators are planned for world 2, for now, speed potions are your best bet for moving up quickly.