An entirely brand new DPS character for a long-forgetten archetype in the game, Cornerstone makes her debut in Reverse: 1999 version 3.8 update patch. In this guide, we will go over everything players need to know to best build Cornerstone to her fullest potential in Reverse: 1999
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Cornerstone Build Guide – Everything You Need To Know
General Introduction
Cornerstone is a 6-Star Character of the Mineral Afflatus and Riposte Archetype. She is the brand new Riposte team damage carry character that has the ability to deal massive amounts of passive and active Riposte damage to enemies.
Incantation Skill And Ultimate Analysis
To understand how Cornerstone works and how to best build her into a powerful Arcanist, we need to know how her Skill and Ultimate works:
| Concrete Functionality (Arcane Skill) | Rank | Effects |
 | 1 | [Attack] 1-target attack. Deals 200% Reality DMG. If in [Inspection Process] status, this attack additionally deals 200% Reality DMG and Critical DMG +40%. This attack counts as 1 riposte. |
| 2 | [Attack] 1-target attack. Deals 300% Reality DMG. If in [Inspection Process] status, this attack additionally deals 200% Reality DMG and Critical DMG +60%. This attack counts as 1 riposte. | |
| 3 | [Attack] 1-target attack. Deals 500% Reality DMG. If in [Inspection Process] status, this attack additionally deals 200% Reality DMG and Critical DMG +100%. This attack counts as 1 riposte. | |
| Importance: High | ||
| Analysis: Cornerstone’s main active damage incantation skill taht allows her to deal powerful damage to enemies while still being considered Riposte damage. | ||
| Figure-Ground Relationship (Arcane Skill) | Rank | Effects |
 | 1 | [Counter] Self-counter. Enters [Inspection Process] status for 2 rounds. Grants self 2 stacks of [Progressive Iteration] for 2 rounds. |
| 2 | [Counter] Self-counter. Enters [Inspection Process] status for 2 rounds. Grants self 3 stacks of [Progressive Iteration] for 2 rounds. | |
| 3 | [Counter] Self-counter. Enters [Inspection Process] status for 2 rounds. Grants self 5 stacks of [Progressive Iteration] for 2 rounds. | |
| Importance: Highest | ||
| Analysis: Cornerstone’s main counter skill that allows her to gain Counterattack stacks and allow her to deal Riposte damage to enemies that attack the team. This also help her to activate her Attack Skill at the end of the enemies’ turns. | ||
| Foundations of Tomorrow (Ultimate) | Effects |
 | Self-counter, enters [Delivery Process] status for 1 round. |
| Importance: Highest | |
| Analysis: Cornerstone’s Ultimate allows her to enter a special mode that massively enhances her Riposte damage and allows her to deal massive amounts of damage to enemies. | |
Inheritance Analysis
Additionally to her skills and abilities, her inheritance level will also affect Cornerstone’ performance in a team:
| Rank | Effects | Analysis |
| 1 | While Cornerstone is on the field, all allies gain [Eligibility Assessment]. Cornerstone gains [Trial and Error]. Cornerstone’s Max Moxie -1, and the Ultimate’s Moxie Cost -1. Insight I Every time an ally takes an extra action, Cornerstone grants self 1 stack of [Progressive Iteration] for 2 rounds. If it is a Riposte, grants 1 additional stack. For every 10 stacks of [Progressive Iteration] gained, Cornerstone grants self 1 stack of [Design Revision]. | Cornerstone’s amazing inheritance allows her to deal more Riposte damage and activate her Ultimate more frequently. |
| 2 | When entering battle, increases ATK by +5%. | This grants Cornerstone a good boost in attack to optimize her damage output. |
| 3 | Own Ultimate does not count toward the ally Spelldock limit. When entering battle, Cornerstone increases self Moxie by +2. Overflowing Moxie is temporarily stored. At the end of the round, if self Moxie has remaining capacity, it is replenished (up to a maximum of 4 stored Moxie). | An amazing inheritance that allows Cornerstone to store her Moxie and use her Ultimate more frequently. |
Cornerstone Playstyle And Combat Role Analysis
Cornerstone’s main role in a team is to be the main DPS character for the Riposte archetype team, with her ability to actively deal damage that is considered Riposte damage to enemies while also reducing the damage taken by all allies in the team and initiate constant counterattacks against enemies that attack the team. Unlike other Riposte characters who can only counterattack whenever they are attacked by enemies, Cornerstone is more active in that she will automatically uses her skill whenever the enemy turns ends, dealing Riposte damage to them even if they didn’t attack the team. She can also buff herself up with her various abilities, allowing her to boost her own damage output massively while also reducing the enemies’ damage to the team.
Upon using her Ultimate, Cornerstone will enter a special state where all of her damage will be enhanced even further and upgrades her Riposte attack, allowing her to deal even more damage to enemies.
Best Psychubes And Resonance Build
Best Psychubes
As a support sustain character for the Conduit archetype, Cornerstone wants Psychubes that help boost her sustain and support effects for the team.
The best Psychube for Cornerstone is:
 | Where Light and Shadows Rest |
| Effect | When entering battle, if the carrier is a [Mineral] character, gains Riposte DMG +8%. After any ally ripostes, the carrier gains Critical DMG +3% for 3 rounds, up to 6 stacks. |
| Analysis | This is Cornerstone’s best Psychube as it massively improves her riposte damage output. |
Resonance Build
For Cornerstone, players should focus on using a Resonance build that boosts her Attack stat as much as possible to optimize her damage output.
Build Code: (To Be Updated)
Rolling Recommendation
Should You Roll For Cornerstone
Not Really. While Cornerstone herself as a main DPS character is relatively strong in the current game meta, the Riposte archetype itself has a lot of flaws and not enough support for it right now, making it hard to optimize the damage output of Cornerstone. That being said, players can roll for her as an investment for the future when other Riposte support characters are released.
Should You Roll For Extra Cornerstone Portraits
Yes. As a Main DPS Carry option for an entire archetype, Cornerstone wants Portrait levels in order to improve her damage output, the higher the portrait levels, the better she will become and the more powerful she will be as a DPS character. The best investment stopping point for low spenders is at P1, but if you really like her, getting her to P4 and P5 is very recommended.
Conclusion
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