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For the ninja, my current plans were:
Plan A: Slam the ninja with an endless stream of fire, all the while gaining Knowledge of the world.
Plan B: Run out of magic potions, take a shuriken to the face, collapse, and die. Repeatedly.
... I probably should have gone with Plan A.
As a level 3, I was getting around 16 shots from full MP. Then I hit 8 Knowledge, and this was reduced to 7 shots. Towards the end, I got to 16 Knowledge, leaving only 4 shots per bottle. The MP cost per fire shot is (Knowledge/8)+1, so the rising Knowledge is a drawback for this battle.
Even though I hit as high as 17 Knowledge before the mentioned collapsing and dieing, I still dealt only 1 damage per attack. Unlike physical attacks, this isn't randomly capable of getting 2 damage. By the time I emptied out my stock of potions, the ninja dropped to 72 HP, starting from 180. Even if I had the MP necessary, I'll still be somewhat slower in this battle than Uncle Mario.
At least I'm gaining another 4955 EXP for Knowledge by the time the GAME OVER shows up. If I remained alive, Knowledge would hit 67. Not bad, but it's only any good if I can get through this battle.
One extra level would help. Although 15 MP may not look like it's enough for 8 2-MP shots, keep in mind I regenerate MP over time. The time it takes for the first seven to get through is enough for 2 MP at times. For some reason, the game refuses to let you use up the last MP through Fire Magic, so that's why I can't cast fire to hit exactly zero MP.
I walked in with 13 doses of M.Potion. Including walking in with a full MP bar, that's 14 "fills" of MP. One more level, and thus one extra shot per fill, would mean roughly 14 more hits in. That's still another 58 HP to go.
I also had seen a 10 dose M.Potion on the way up the Tower. It is somewhat out of the way, and would mean I lose the 20 shot Falchion in 6F, but might get me another 50 shots of Fire Magic at level 4, going by the 16 ~ 23 Knowledge range at level 4. Still short 8 HP, but at least it's just 8 to burn through now.
Another 64 shots would be enough to hit 90+ Knowledge with little trouble. Again, I'd be slower in ninja slaying than the Sword of Flames strategy, but my goal is to keep Arm Strength low until Fortress.
That goal looks to be difficult to keep without a great loss at the ninja, though...