BossAltus PlateauChanged in 1 patchVerified on build 25080141

Ancient Dragon Lansseax

9,087 HP at Altus Plateau · Rampartside Path and its 1 other place, with the area's scaling applied. It takes the most damage from Pierce and the least from Lightning.

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
Altus Plateau · Erdtree-Gazing Hill	9,087	120	×4.844
Altus Plateau · Rampartside Path	9,087	120	×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.

Standard35%

Slash35%

Strike35%

Pierce10%

Magic40%

Fire40%

Lightning80%

Holy40%

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	557	847	1,304	1,304
Scarlet Rot	557	847	1,304	1,304
Bleed	557	847	1,304	1,304
Frost	557	847	1,304	1,304
Sleep	Immune
Madness	Immune
Death Blight	Immune

HP in each journey

At Altus Plateau · Rampartside Path: 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
9,087	11,486	12,635	13,209	13,783	14,932	15,506	16,080

How its AI decides verified

Its attack choices change at 85%, 60% 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 5 m, 11 m, 15 m.
It chooses among 37 attack routines; 13 have a cooldown (5–60 s).

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 Ancient Dragon Lansseax 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 Ancient Dragon Lansseax

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
- HP1,732→1,876
- Standard negation40%→35%
- Slash negation40%→35%
- Strike negation40%→35%
- Pierce negation40%→10%