- Available: Enter Inaba Pride Exhibit Night 3 the first time
- Rewards: All-Around Badge (Accessory), 4300 EXP
Elizabeth has detected another spatial void, which is on the final floor of Evil Spirit Club. First of all, the Soul Seeker is weak to ice attacks and has resistances to all of the ailments and Magic Bind. Despite that, you will still want to make Magic Bind stick, since all of its attacks are of the magical nature. In fact, if you can keep Magic Bind on the optional boss the entire fight, then you should have no trouble defeating it at all, since its physical attack is very weak.
As far as attacks go, the Soul Seeker has a few nasty ones, like Evil Smile and both Mudoon/Mamudoon, although it won't use the latter until later on in the fight (under 25% HP). It also uses fire attacks, particularly Maragion in the beginning stages, then Agidyne and lastly, Maragidyne in the last stages, so don't bring anyone who is weak to fire to the fight. In the middle portion of the fight, it also has access to Stone Mist, which can petrify your whole party on an unlucky day, so either have access to Me Patra or buy some Patra Gems.
Naturally, its most dangerous attacks are Mudoon, Mamudoon and Stone Mist, so you're going to want to boost your own evasion (Masukunda) and/or decrease the boss' accuracy (Sukunda). Also, you want party members who are resistant to Dark, so the Persona 4 Protagonist is great for this (especially if you finished The Power of the Wild Card as his Persona will null Dark), as is Koromaru. The Persona 3 Protagonist might be a hindrance, but if you're playing the P3 side, then you're stuck with him, so wear the Dark Pin or get Resist Dark on his Sub-Persona. Of course, if you can get Magic Bind to stick on the boss, then you don't have to worry about it at all.