RegulusBuild and Guide

Regulus holds a good balance between damage and utility for the team. She only needs Insight 1 to make use of her [Restless Heart] passive, which grants +50% Critical Rate when Regulus doesn’t act for one round. That makes Regulus a very AP-generous character, as it allows the player to use that round to manage cards and prepare for a burst window or focus on other teammates’ actions. She also has the rare trait of turning excess of Critical Rate into Critical DMG, allowing her personal damage to be boosted further when being part of Crit. Oriented teams. 

Try to take advantage of this downtime to always have the skill “Challenge for the Eyes” at level 2 or above. While “Treat for the Ears” is Regulus’ main damage source, “Challenge for the Eyes” on the other hand doesn’t deal much damage by itself. It can, however, reduce up to 2 moxie from the enemy when scoring a critical hit, thus allowing Regulus to negate Ultimates, even from enemies who are immune to crowd control.

Finally, “Sleepless Rave” deals damage to all enemies while applying the effect [Riot and Roll] on all allies for one round, allowing them to dodge any non-Ultimate attacks. This tool becomes progressively more useful later in the game, when powerful attacks from the enemy team become constant. Just keep in mind that characters under [Conceal] will leave that status once acting (Regulus herself included). That means, if your goal is to avoid attacks, use the Ult as your last action in the round.