Guide on How to Defeat Fionn mac Cumhaill in Shin Megami Tensei V
How to face Fionn mac Cumhaill
In order to face Fionn mac Cumhaill in battle, continue playing the main story and reach the Shinagawa Region. From the Mitatebashi Leyline Crossing, keep going west and trigger a cutscene. After the cutscene, battle the boss automatically. Make sure to save your game before the boss fight.
Fionn mac Cumhaill Boss Information
Here is a breakdown of the boss’ stats, strengths and weaknesses, and skills:
Fionn mac Cumhaill Details
|Boss Type||Main Story Boss|
|Recommended Level||Level 32 or higher|
|Recommended Party Members||Yoshitsune, Valkyrie, Zouchoten, or any ally demons.|
Fionn mac Cumhaill Strength and Weaknesses
Fionn mac Cumhaill Skills
|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||Raise Attack of 1 ally by 1 rank for 3 turns.|
|Omagatoki: Critical||All attacks, including magical attacks, will become Critical hits for all allies for 1 turn.|
Fionn mac Cumhaill Boss Setup
Here is a breakdown of the battle preparation against the boss:
Carry HP and MP recovery items
Before engaging the boss, bring HP and MP recovery items in case your party runs out of HP and MP during battle. Also, don’t forget Ailment recovery items such as Amrita Soda.
Max your Magatsuhi Gauge
In addition, make sure that your Magatsuhi gauge is already maxed. Having it maxed prior to battle is helpful in setting up your offense. Also, having a Miracle skill, Magatsuhi Wellspring, will provide your party HP and MP recovery at the start of your party’s turn.
Assign Nahobino Elec skills
Make sure to import Electricity skills if you can in order to exploit the weakness of the boss. Otherwise, you can rely on your ally demons to have those skills for you. To add, complement your offense with strong Physical skills like Aramasa.
Furthermore, put in Support and Passive skills to boost damage if there are still skill slots remaining. Recovery skills are optional if your active party members do not have these skills. This is to sustain the party during battle.
Attach affinities to Nahobino that nullify Phys, Fire, and Ice skills
With the Divine Amalgamation Miracle, Nahobino can implant skill potential from essences. Add to Nahobino affinities that can Reflect/Absorb/Void/Resist Physical, Fire, and Ice skills.
Pick ally demons that can counter Phys, Fire, and Ice skills
Bring party members can innately Reflect/Absorb/Void/Resist Physical, Fire, and Ice skills if possible. If you can’t, make it a point that their weaknesses are covered during battle. You can make use of Physical, Fire, and Ice Block skills or make use of Dampener items.
Add demons that can use Phys and Elec skills
Similarly, add demons to your active party that can use Physical and Electricity skills. If they don’t have access to those skills, utilize Essence Fusion to grab those skills from demon essences.
Fionn mac Cumhaill Boss Strategies
Here is a breakdown of the battle strategies against the boss:
Pass action to support demons
If you start the battle with Nahobino and don’t have access to debuff/buff Support skills, make use of the Press Turn System and pass your turn to demon allies that can use debuff Support skills.
Land debuffs on the boss while leaving some MP for offense and recovery. Debuffs are in the form of attack power decrease (Tarunda), defense power decrease (Rakunda), and hit/evasion power decrease (Sukunda). In addition to these Support skills, you can utilize skills from other types such as Fang Breaker (Tarunda), Pierce Armor (Rakunda), Toxic Spray (Rakunda), and Blinding Strike (Sukunda) to cast similar effects. These debuffs can be accessed by Nahobino and any demons in your party.
Prioritize on landing Sukunda first. Followed by Rakunda and Tarunda. Since the boss will keep on using its Tarukaja skill, land -nda debuffs again or Dekaja to nullify its effect during battle.
Cast buffs on your party members as well. Buffs can be in the form of attack power increase (Tarukaja/Matarukaja), defense power increase (Rakukaja/Marakukaja), and hit/evasion power increase (Sukukaja/Masukukaja). These buffs can be accessed by Nahobino and any demons in your party.
Prioritize on landing Sukukaja first. Followed by Tarukaja and Rakukaja. You may also use Charge/Donum Gladi and Concentrate/Donum Magici buffs to boost your party’s damage even further if available. Since the boss will keep on using its Pierce Armor skill against your party, cast -kaja buffs again or Dekunda to remove its effect during battle.
Cure inflicted Ailments
If a party member got inflicted with an Ailment such as Seal, make sure that you have access to Ailment recovery skills such as Patra or Me Patra to cure it. You can also use status recovery items such as Amrita Soda to remove them if available. Ailment recovery skills can be accessed by Nahobino and any demons in your party.
Activate Magatsuhi skill
Unleash the Magatsuhi skill such as Omagatoki: Critical to boost your damage even further. Make sure to use it once debuffs and buffs are already set. Activate the Magatsuhi skill on Nahobino’s turn and you will have up to 8 possible actions against the boss.
Use Elec skills against Fionn mac Cumhaill
Fionn mac Cumhaill is weak against Electricity skills which Nahobino and his ally demons can capitalize on. The damage will be higher if the party is buffed with Tarukaja/Matarukaja and Concentrate/Donum Magici.
Use Phys skills against Fionn mac Cumhaill
Fionn mac Cumhaill does not have resistance against Physical skills so add party members that specialize in this skill type. The damage will be higher if the party is buffed with Tarukaja/Matarukaja and Charge/Donum Gladi. Also, use Nahobino’s Aramasa skill against the boss constantly while you’re not commanding him to set up debuffs or buffs or healing.
Keep the party’s HP sustained by using healing skills. Especially when other party members are getting overwhelmed by enemy damage.
Fionn mac Cumhaill Boss Video
Here is a boss fight video against Fionn mac Cumhaill. The battle is already timestamped so you no longer need to browse through the whole video:
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