Let's Play 7th Fantasy (Lulu) Ep. 10: Why Speed Is Vital
The Spideks in the Patrof Tunnel are very agile, and frequently will dodge your attacks and spells. When I was a kid these enemies always gave me headaches, though it took me a while to figure out that Speed was the culprit.
Unfortunately, we won't find a store that sells Bottles of Agility until quite a bit later on, and neither Lulu nor Cloud are capable of learning the Fast spell. So you just have to rough it through this passage, which I consider to be one of the hardest dungeons in the game.
REMEMBER! You can use the Water Rune to heal HP for FREE, but it only works during battle and only 50-70 HP per round. The game gives you Runes for a reason - use them! Also feel free to take advantage of Lulu's Osmose spell (called MP Catcher in the original) and save your MP Herbs for Cloud. Manrots and Black Demons are excellent targets to steal MP from.
WEAKNESSES: Spideks and Red Tricks are both weak to Ice magic.