Spirit City has three player-documented Acts and is widely searched as the route to Kenpachi. That search name is useful for finding the mode, but current public evidence does not safely prove which in-game entity, form or drop card it maps to. Check the Raid selector instead of silently equating the alias with 8th Sword (Berserk).
Spirit City Act and reward index
Spirit of the Moonblade is listed for Reaper (Released), while Hair Bells is listed for 8th Sword (Berserk). Those equipment relationships are documented; the displayed percentage rolls on individual copies are not guaranteed fixed stats. Exact drop rate, pity, Spirit Token payout, shop prices and any Kenpachi character chance remain deliberately unfilled until the current UI is captured.
Safe clear plan
Bring a cheap opener, a developed area carry, one boss specialist, a damage amplifier and control only when the enemy panel does not show immunity. On the first run, note the wave where the defense fails and upgrade the unit that solves that failure. For repeat farming, a stable clear is more valuable than a higher Act with frequent losses.
Spirit City video route
This player route confirms current interest in Acts 1-3 and the Kenpachi chase. Verify every reward field in your server before treating the video as a drop table.
Compare the broader Raids guide, 8th Sword page and equipment compendium.