This is a walkthrough for the boss Fionn mac Cumhaill found in Mitatebashi in Shin Megami Tensei V. All of his weaknesses, resistances and skills to avoid.

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Fionn will be quite a challenging boss

Stats and Resistances¶

Icon	Name	Lv	Weakness	Resistances	Location
	Fionn mac Cumhaill	32		(RESIST), (RESIST)	On bridge west of Mitatebashi Leyline in Shinagawa

Skills¶

Type	Skill	Effect
	Mac an Luin +5	Severe Physical attack to 1 foe. Greater effect if a Critical hit.
	Dark Sword +5	2 medium attacks to 1 foe. Chance of inflicting Seal.
	Pierce Armor +5	Weak Physical attack to 1 foe. Lowers target’s Defense by 1 rank for 3 turns.
	Bufula +3	Medium Ice attack to 1 foe.
	Maragion +4	Medium Fire attack to all foes.
	Tarukaja	Raises Attack of 1 ally by 1 rank for 3 turns.

Recommended Party¶

Icon	Name
/	Shiki-Ouji/Basilisk
	Lilim
	Cironnup

Fionn mac Cumhaill can be quite the brutal boss, especially if you are not prepared for him. He is mainly physical and with his potential for that, his skills can hit pretty hard. Couple this with the fact he can use Tarukaja to buff his attack, you will want Tarunda in this battle. Pierce Armor is annoying, not because of the damage, but because it will debuff a character’s Defense. Likewise, Dark Sword will do a good bit of damage, but the more annoying aspect is that it has a chance of inflicting Seal, an ailment that prevents you from using skills. By far, the most devasting skill in his arsenal is Mac an Luin, a severe Physical attack to one character.

If you don’t debuff his attack and he uses Tarukaja once or twice, Mac an Luin will likely one-hit kill some characters. This is why it’s imperative to have Physical resistance on the Nahobino. You should see that there is both Bufula and Maragion listed in Fionn’s skills. Bufula doesn’t seem to be used too often, and Maragion is reserved for whenever he gathers Magatsuhi. That means you can easily know when the latter is coming, so it’s possible to just toss up a Fire Dampener to block the attack and waste his turns. The battle can be long and grueling, depending on some factors, so it’s important to have a means of healing, either through the Nahobino’s Miracle Water, or with Media/Diarama.

As seen, Fionn is weak to Electric, and blocks both Fire and Light. You should be prepared with Zionga on most characters and Ruinous Thunder on the Nahobino. the Type-4 Essence also has Spirit Drain on it, which is useful to get back some MP, if running low. Cironnup is a great demon to have in the party for this battle, since it resists both Fire and Ice (you don’t need to worry about Fire too much). Also, it has Blinding Strike, a Physical skill that does a little bit of damage, but more importantly, can debuff the target’s accuracy/evasion. Get it to level 30 and you will also have Cautious Cheer, a skill that raises the defense/accuracy/evasion of the entire party for three turns.

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(1 of 3) Blinding Strike is a great attack skill, since it also debuffs accuracy/evasion

Hua Po isn’t a bad choice, despite the obvious weakness to Ice, since she has access to Media and a good Magic stat, so you can put Zionga on her. Basilisk can be another good choice, since it is resistant to both Fire and Ice, has good defense and higher than normal Strength for its physical attacks. However, Shiki-Ouji would be ideal, as he resists Physical and can be given Zionga through essences. If you get to level 32, then you can fuse Lilim, who learns Zionga at 33. Of course, if you have Elec Gems, then those will also work. It will definitely be a long and arduous battle, but keeping Tarukaja in check will be a key part. Rationing your MP is another key factor, so hopefully you’ve been saving Chakra Drops.