Yeap looks like it, 2 Souls to unlock with Holy SPs you can earn during the event, also alot of Grimoires and SP to be had.
I can share a few nuggets of wisdom in the smashing ive been doing tonight (mostly solo being in Australia). Been using this party so far and has been working well: Andromeda (Sniper Shot EX skill), Satan, Susanoo, Beelzebub and Sol, with Amon Unleashed and Amaterasu in the reserves. Apocalypse as the Eidolon.
- The Overdrive attack from the Ultimate demon isnt honestly that bad in Rage mode, usually averages about 2k damage on your party if your doing appropriate debuffs but its alot of scattered attacks.
- Having 2 healers for Ultimate helps alot here, its a bit of a slog (im using Andromeda and Sol myself). Level 5 Ultimate demon for example has 3.8 million HP.
- Have a dispel in your party is important here! The Ultimate demon when it uses its Overdrive attack in non-rage mode gets a +ATK buff that causes her basic attacks to do 4k+ damage each. Sol is a great choice here if you have her, save her Red ability to dispel that buff. (Seems to be up often enough for this, you will push her into Rage pretty often)
- Ive been using my Grails (the ones you get from doing Lilims) for +ATK, +HP, +Recovery and +Triple ATK, would love some more info on the best buffs here.
- If you have a decent party you can just auto battle the expert Lilim and the expert Demons (my Dark team has 39K attack so your mileage may vary) they are pretty straight forward.