Cornerstone
Cornerstone is a 6★ Mineral Arcanist in Reverse: 1999. Below are the exact Insight materials needed to ascend them, plus other Mineral Arcanists to build alongside.
Data updated: 2026-07-11
Cornerstone — Review & Analysis
Cornerstone is a Mineral-Afflatus Counter DPS built around Self-Counter: both her Incantation 2 and Ultimate trigger self-counters, letting her strike outside her turn. Her single-target nuke (Constructive Practice) explodes while under Review Process, adding extra Reality DMG and Crit DMG. She also carries a support aura, granting Feasibility Deduction to the whole team while stacking her own ATK through Design Upgrade over time.
- Self-Counter loop: her Incantation 2 and Ultimate both self-counter, enabling off-turn hits and a big burst under Review Process (extra 500% Reality DMG + 100% Crit DMG).
- Damages and buffs at once: grants the whole party Feasibility Deduction, cuts 1 Moxie off her Ultimate cost, and enters battle with +2 Moxie for early access.
- Snowballs over time: every 10 stacks of Creative Iteration convert into 1 stack of Design Upgrade for stacking ATK, and stored excess Moxie keeps her rotation flowing.
- Mineral counters Beast (+30% DMG).
- Backloaded payoff: she must build up Creative Iteration and leans on allies taking extra actions to feed stacks — weaker in teams lacking counter / extra-action synergy.
- Her main hit is single-target with little AoE clear, and Mineral is countered by Star.
Prioritize leveling Constructive Practice (her main damage source) first, then the Ultimate to sustain the Self-Counter rhythm and Delivery Process. Since her strongest hit needs Review Process for the Crit DMG spike, run an ATK / Crit-oriented Psychube to maximize the burst, and favor Crit and ATK stats on her gear.
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 | 1,493 | 2,266 | 3,600 | 5,266 | 6,066 |
| ATK | 291 | 441 | 701 | 1,025 | 1,181 |
| Reality DEF | 127 | 193 | 306 | 448 | 516 |
| Mental DEF | 127 | 193 | 306 | 448 | 516 |
Cornerstone — Skills & Incantations
Constructive Practice
Incantation “Form follows function. Remember it, understand it, practice it.”
Figure-Ground Relationship
Incantation “Understand this gray, understand its shape and form, understand all of it.”
A Vision, Founded Here
Ultimate “With earth, with geometric structure, with primal power and ideals.”
As It Is
Incantation “Her own Ultimate does not take up the party's Incantation card acquisition limit; upon entering battle, Cornerstone gains +2 Moxie for herself; any excess Moxie is temporarily stored, and is replenished at the end of the round if she has spare Moxie capacity, storing up to 4 points of Moxie.”
Insight Materials
Insight 1
Insight 2
Insight 3
Resonance Materials
All 14 Resonance levels
Teams with Cornerstone
Anjo Nala, Recoleta and Cornerstone all tap into Ultimate together with Moxie — combining it across three kits at once outperforms any single carry doing it alone. Ezra Theodore keeps the line-up alive with Shield so that payoff has time to land.
Teams →
