Fortification
Beginning a battle boosts Fortitude by 1/2/3. Fortitude boosts Emma's defense for a time. Every Spirit Stone carries two things at once: a stat boost — here Max HP: 57 at rank 3 — 19 per rank — and an effect, and both scale with the stone's rank rather than with anything you do to it.
Read from the in-game tooltip panel
- Character
- Emma
- Category
- Spirit Stone
- Attack
- Max HP: 57 at rank 3 — 19 per rank
- Role
- Defense buff at battle start
- Applies to
- 17 September 2026 update
Where this comes from
LaserBolt — How To Become Powerful Early (Armor, Weapons, Charm) — opens at 02:16, where the piece of gear is explained.
When to use it
Onslaught's defensive twin, down to the 1/2/3 tiering. Fortitude is also what the Golem Incense Skill Amber grants, which makes it the one buff in this game reachable from both an Emma slot and a Koo slot. This is the stone that exposed how the whole system works: a rank-2 copy reads HP 38 on its own panel, exactly two thirds of the published 57, and its Effect Details lists Lv.1/2/3 with the equipped rank marked Active. Every other stat figure in this table is a rank-3 ceiling read the same way.
Where it sits in the gear catalogue
- Its stat half is a HP ceiling of 57, which is the eleventh-highest of the seventeen HP ceilings among the 33 Spirit Stones catalogued here. The rest of that group: Momentum (102), Stone Mind (90), Homing Shots (90), Dark Approach (80), Critical Damage Increase (80), Transcendent Bloom (69), Entanglement Increase (65), Empowered Headshots (65), Faster Reloads (65), Infernal End (65), Final Infusion (54), Well of Fortitude (48), Sharpshooter (39), Entangled Assassination (39), Break Recovery (39) and Entanglement Stone (33).
- 25 of the 33 stones point at the same system as this one — How Spirit Stones work — ranks, why the published figure is a ceiling, and duplication — which is where the rank arithmetic behind every figure above is worked out.
Sources for this page
- LaserBolt — How To Become Powerful Early (Armor, Weapons, Charm) — Hands-on, 8:19, read 2026-08-06, and it corrects the *shape* of two systems rather than a number in them.
What this source gets right, where its transcription is unreliable and what this site corrects is set out in full on the Gear hub.
The system this belongs to