Stage 1 — Sword and Shield
Sir Isaac combines shield pressure with measured sword strings. Wait for the complete sequence before committing to a punish.
Boss GuideConfirmed
Sir Isaac, the Scholar-Prince
Corrupted Gate Major Boss
Sir Isaac, the Scholar-Prince is the Corrupted Gate boss of Faded Citadel. His opening sword-and-shield pressure gives way to faster multi-hit strings and shorter punish windows after he discards the shield.
- Campaign Major Boss
- Corrupted Gate
- Mammon
At a glance
Quick Facts
Class
Campaign Major Boss
Progression Group
Corrupted Gate
Region
Mammon
Area
Faded Citadel
World Entry
Gate of Infinity
Pre-fight Checkpoint
Citadel Atrium
Where to Find Sir Isaac, the Scholar-Prince
Region
Mammon
Area
Faded Citadel
World Entry
Gate of Infinity
Internal Pre-fight Checkpoint
Citadel Atrium
Citadel Annex and Citadel Atrium are internal Beacons on the recommended route through Faded Citadel.
Scholar-Prince’s Chamber is the post-fight Beacon for this encounter.
Faded Gland appears earlier on the route and is not a direct Sir Isaac reward.
How to Reach Sir Isaac, the Scholar-Prince
First visit
Recommended First-time Route
Use Gate of Infinity to enter Faded Citadel, then follow the blue-lantern route through Ashen Sanctum toward Citadel Annex and Citadel Atrium.
Enter Faded Citadel through Gate of Infinity.
Follow the blue-lantern route through the Ashen Sanctum approach.
Reach and activate Citadel Annex.
Continue through the citadel to Citadel Atrium and activate the Beacon.
Follow the bone-gate route beyond Citadel Atrium.
Continue along the final approach and enter Sir Isaac’s arena.
Arena Trigger
Follow the bone-gate route beyond Citadel Atrium and continue into the arena.
Activate Citadel Atrium before continuing along the final approach.
How to Beat Sir Isaac, the Scholar-Prince
Sir Isaac begins behind shield pressure while using deliberate sword combinations. After removing the shield, he shifts into faster multi-hit strings with shorter openings between attacks.
Learn how long each sword string lasts before attacking, and reduce the length of each punish once the faster second stage begins.
Fight structure
Phases
Stage 2 — Shield Removed
After discarding the shield, Sir Isaac uses faster multi-hit strings and leaves shorter punish windows.
Readable cues
Attacks & Counters
Leaping lunge
- Cue
- Sir Isaac closes distance with a forward leap and sword lunge.
- Safe response
- Watch the approach rather than attacking into it, then reposition after the lunge completes.
Long sword combinations
- Cue
- A sword strike continues into a longer sequence instead of ending after the first swing.
- Safe response
- Avoid committing during the string. Harden can be safer than trying to dodge every unfamiliar hit.
Second-stage multi-hit strings
- Cue
- With the shield removed, the sword sequence becomes faster and leaves less recovery time.
- Safe response
- Use shorter punishes and reset your spacing before the next sequence begins.
Decision framework
Core Strategy
- Learn the length of each sword string before committing to an attack.
- Respect the shield pressure instead of forcing damage through the opening stage.
- Shorten every punish after the shield is removed and the multi-hit strings accelerate.
Rewards & Outcomes
Scholar’s Wormstone
A Weapon Ability Tarstone related to the Clockwork Scythe, awarded for defeating Sir Isaac.
View related Weapon →Nightmare Fuel
Awarded for defeating Sir Isaac, the Scholar-Prince.
Scholar-Prince’s Chamber
The post-fight Beacon and progression outcome for this Corrupted Gate.
Patch Context
Week 1 Update
The PC / Steam Week 1 Update improved arena navigation, removed an unintended extra second-stage lunge, and fixed a phase-transition riposte issue near walls.
Sir Isaac, the Scholar-Prince FAQ
Where is Sir Isaac, the Scholar-Prince?
Sir Isaac is the Corrupted Gate boss in Faded Citadel, Mammon. Enter through Gate of Infinity and follow the internal route toward Citadel Atrium.
Which Beacon should you use before Sir Isaac?
Activate Citadel Atrium before taking the bone-gate route to the arena.
Does Sir Isaac have two fight stages?
Yes. He begins with sword-and-shield pressure, then removes the shield and uses faster multi-hit strings with shorter punish windows.
How should you handle Sir Isaac’s long sword strings?
Wait for the complete combination before attacking. Harden can be safer than trying to dodge every hit in an unfamiliar sequence.
What does Sir Isaac drop?
Defeating Sir Isaac awards Scholar’s Wormstone, a Weapon Ability Tarstone related to the Clockwork Scythe.
Can you summon a Shell for Sir Isaac?
Yes. Lazlo is available as optional fight support for 1 Glimpse and is not required.
Sources & Verification
Research reviewed 2026-09-02 against the August 29 Week 1 Update.