Reaper City Boss Rush on Nightmare can be cleared solo and left to run itself in Universal Tower Defense Update 4.0. The setup leans on one money generator, a Pirate King that can be re-placed for free, and two elemental damage units that punish the stage’s Ice enemies. Once the run works once, you record it as a macro and repeat it for badges and gems without playing manually.
Quick answer: Place Bulma for income, put down a Pirate King you sell and re-place each wave for free, add Joyful Captain (Fire) and Zoro (Wind) as your main damage against the Ice enemies, buff them with Crow Shinobi and Prodigy Mage, then record the whole run as a macro to loop it AFK.
Stage conditions for Reaper City Boss Rush
The run takes place on the Reaper City – Act Boss Rush stage across 30 waves on Nightmare difficulty. Enemies carry the Ice element, which makes Wind and Fire the strong counter elements. Your damage plan is built entirely around that weakness, so Fire and Wind DPS do the heavy lifting while a control unit locks the path.
| Detail | Value |
|---|---|
| Stage | Reaper City – Act Boss Rush |
| Difficulty | Nightmare |
| Waves | 30 |
| Enemy element | Ice |
| Strong elements | Wind, Fire |
| Final bosses | The Fatality and The King |
Units and relics you need
Six units carry the run. Bulma exists only to make money, Pirate King handles early defense and freeze utility, and Joyful Captain plus Zoro are the primary DPS matched to the stage element. Crow Shinobi and Prodigy Mage sit on crates and buff the carries. The relics below match how each unit is geared.
| Unit | Rarity | Role | Relics |
|---|---|---|---|
| Bulma | Legendary | Income generator | — |
| Pirate King (Voyage) | Secret | Early defense, stun/freeze | Warlord Set (Hat, Top, Skirt) |
| Joyful Captain (Luffy) | Celestial | Fire DPS | Sun God Divine Smoke, Warlord Top |
| Triple Threat (Zoro) | Mythic | Wind DPS | Warlord Top, Warlord Skirt, Warlord Hat |
| Prodigy Mage (Apprentice) | Mythic | Attack speed/range buff | Super Roku Shirt, Super Roku Pants |
| Crow Shinobi (Reanimated) | Mythic | Support | Rebellious Shinobi Top, Pants, Bloodline Eye |
The Pirate King free-replacement trick
The core of the strategy is Pirate King’s passive, The Spark of the Great Era. When you sell Pirate King and place a new one, he keeps every upgrade and costs 0 Yen to set down again. That lets you shift him further up the path or reset his position each wave without losing progress or spending money.
You repeat this sell-and-replace several times through the run to keep his range and freeze on the newest section of the path. It is also how you secure the final waves against The Fatality and The King, since you can re-position him for full path coverage right before the bosses arrive.
Wave-by-wave placement
[Switch Units] prompt to confirm your six units. On Wave 1 with 500 Yen, place Bulma near the center of the map and put Pirate King close to the enemy spawn path so he carries the early waves.[Auto-Upgrade] to ON for Bulma so her money generation climbs on its own.[Charge], set the Custom Attack Speed to 1 SPA, and confirm.
Why the element pairing matters
Ice enemies take extra damage from Wind and Fire, so Joyful Captain (Fire) and Zoro (Wind) are the two units that actually kill the waves. Pirate King is not there for raw damage; his job is the stun and freeze that hold enemies in place while the carries hit them. Keeping that split clear is what makes the clear consistent rather than relying on overwhelming numbers.
Record the run as an AFK macro
The stage uses a built-in Macro menu on the right side of the screen, so you can capture the entire winning run and replay it for AFK farming.
[Delete] on Slot 1, then click [Load] on the empty slot and hit the record button so it shows [Recording..].[Start 0/1] at the top to begin the match and play through the placement sequence above exactly once."Saved your recording to Slot 1 when the match ended!" confirms the macro is stored and ready to replay for future runs.
How you know it worked
A successful clear ends with The King defeated and the victory screen reading Reaper City Won on Nightmare. A full run lands around a play time of 00:26:23, and the reward payout confirms the clear.
| Reward | Amount |
|---|---|
| SoulReaperBadge | x60 |
| UniversalGemsSeason1 | x11K |
| Gems | x500 |
| Coins | x4K |
The same crate-and-corner logic transfers to Reaper City – Act 5, where Bulma and Pirate King start in similar spots and Joyful Captain goes on the corner of the loop to widen his area coverage. Once your relics and units match the table, the recorded macro turns Boss Rush into a repeatable farm you can start and walk away from. You can jump into the stage directly through the official Universal Tower Defense Roblox page.
