BossForbidden LandsChanged in 1 patchVerified on build 25080141

Fell Twin

Fought in 2 places, from 6,539 HP to 7,871 HP at Forbidden Lands · Divine Tower of East Altus: Gate: each placement carries its own area scaling. It takes the most damage from Slash and the least from Holy.

Where you fight it 2

Each place uses its own copy of the boss with that area's scaling. HP and stance as you meet them (first phase, offline, no new game plus).

Place	HP	Stance	Scaling
Forbidden Lands · Divine Tower of East Altus: Gate	6,539	65	×4.844
Forbidden Lands · Divine Tower of East Altus: Gate	7,871	65	×4.844

Damage negation

How much of each damage type it shrugs off. Lower is better for you; the type it takes most is highlighted.

Standard0%

Slash-10%

Strike0%

Pierce0%

Magic0%

Fire0%

Lightning0%

Holy20%

Flat defense

Subtracted from each hit before negation; it matters most for weak hits. Area scaling raises it along with HP.

Physical115

Magic115

Fire115

Lightning115

Holy115

Status buildup to proc

Buildup needed for the first proc, and how much more each following proc needs (it grows after every proc, up to the fifth).

Status	1st proc	2nd	3rd	4th
Poison	248	290	388	678
Scarlet Rot	248	290	388	678
Bleed	248	290	388	678
Frost	248	290	388	678
Sleep	248	290	388	678
Madness	Immune
Death Blight	Immune

HP in each journey

At Forbidden Lands · Divine Tower of East Altus: Gate: new game plus multiplies HP, defense and resistances again on top of the area's scaling.

NG	NG+1	NG+2	NG+3	NG+4	NG+5	NG+6	NG+7
7,871	9,949	10,944	11,442	11,939	12,934	13,431	13,929

How its AI decides verified

Its attack choices change at 90% of its HP: some attacks unlock, get likelier or are forced below those points.
It picks attacks by how far you are, with cut-offs at 2 m, 2.5 m, 4 m, 6 m, 15 m, 18 m.
It chooses among 49 attack routines.

Read from the game's AI script for this boss. Which animation each routine plays isn't named yet.

Kill-speed simulator New

How many hits Fell Twin takes with your weapon and stats, in any journey: damage per hit through its defense and negations, stance, and status procs as its thresholds grow.

Simulate Fell Twin

Patch history 1

Every patch that changed its numbers, read from the game's balance file (regulation) of each version.

1.02.1from 1.00
- Slash negation-20%→-10%
- Pierce negation-20%→0%