Mr. Duncan
Mr. Duncan is a 5★ Beast Arcanist in Reverse: 1999. Below are the exact Insight materials needed to ascend them, plus other Beast Arcanists to build alongside.
Data updated: 2026-07-11
Mr. Duncan — Review & Analysis
Mr. Duncan is a 5★ Beast single-target DPS built around stacking Bullet and crit. His Ultimate deals 500% Reality DMG and grants +10% Crit Rate per type of Bullet held, so you must load bullets with his second skill before unleashing it for peak damage. Incantation 1 hits 2 targets with an execute rider: units below 50% HP take extra Origin DMG equal to 150% ATK, making him a finisher against low-HP foes.
- Self-amplifying Ultimate: +10% Crit Rate per type of Bullet held, so the more you load, the harder his damage spikes.
- Incantation 1 carries an execute effect — extra Origin DMG equal to 150% ATK on targets below 50% HP, cleaning up low-HP foes fast.
- Self-sufficient buffing: his second skill loads up to 5 Veteran's Cartridge and grants Quick Draw, so he ramps without leaning heavily on teammates.
- Needs ramp-up time: you must load Bullet with his second skill first, so his Ultimate only reaches full crit power a few turns into a fight.
- Beast is countered by Mineral — facing Mineral targets puts him at a damage disadvantage, and his D tier placement reflects a limited overall ceiling.
Level his Ultimate first to maximize the 500% multiplier and the crit bonus scaling with bullet types, then his second skill (Ramshackle Invention) since it is the Bullet source that dictates his burst; raise Incantation 1 last. Since he scales off ATK and crit, pick Psychubes geared toward ATK boost and crit rate/DMG to push his single-target ceiling; if early crit rate is short, a crit-rate Psychube keeps him consistent.
Overview
Base Stats (max level)
| Base Stats (max level) | Lv.1 | Lv.30 | Insight 1 · Lv.40 | Insight 2 · Lv.50 | Insight 3 · Lv.60 |
|---|---|---|---|---|---|
| HP | 1,326 | 2,013 | 3,347 | 5,031 | 5,919 |
| ATK | 235 | 356 | 596 | 889 | 1,046 |
| Reality DEF | 138 | 209 | 351 | 523 | 615 |
| Mental DEF | 102 | 155 | 260 | 387 | 455 |
| Crit Rate | 0% | 0% | 0% | 0% | 14.2% |
| Crit DMG | 0% | 0% | 0% | 0% | 151.3% |
Mr. Duncan — Skills & Incantations
Fatal Ditty
Incantation “Insight II: Mass attack. Deals 175% Reality DMG to 2 enemies and an additional (own ATK x150%) Genesis DMG to the enemy if it is below 50% HP.”
Ramshackle Invention
Incantation “Insight II: 1-target counter. Gains 5 bullets from 【Veteran's Cartridge】 and enters the 【Quick Draw】 status for 2 rounds.”
An Old Soldier's Salute
Ultimate “Insight I: 1-target attack. Deals 500% Reality DMG to an enemy. For each type of 【Bullet】 held on self, this attack gains an additional Critical Rate +20%.”
Skill Quotes
“This is a simple musical instrument.”
“This is a simple musical instrument, and also a weapon.”
“This is a simple musical instrument, and also a weapon that protects him from danger and loneliness.”
“Improvised materials.”
“Improvised materials and a dash of inspiration.”
“Improvised materials, a dash of inspiration, and fifty years of living experience.”
“An adrenaline rush that far surpasses the finest wines.”
Insight Materials
Insight 1
Insight 2
Insight 3
Resonance Materials
All 14 Resonance levels
Recommended Psychubes
Where to Get
Teams with Mr. Duncan
Lopera, Mondlicht and Igor all tap into Bullet together with Crit — combining it across three kits at once outperforms any single carry doing it alone. Sentinel keeps the line-up alive with Shield so that payoff has time to land.
Teams →
Pickles, Mr. Duncan and Desert Flannel all tap into Riposte together with Moxie — combining it across three kits at once outperforms any single carry doing it alone. Moldir keeps the line-up alive with Shield so that payoff has time to land.
Teams →
