Game Mechanic Guide

Harmony Supports in Honkai: Star Rail — Guide 2026

Harmony units multiply the carry's output through action-advance, CRIT DMG buffs, and team-wide damage amps. Bronya and Sunday double single-carry turns; Robin and Ruan Mei amplify the whole team. Build them for Speed and Energy, not damage.

Action-Advance vs Team Amp

Bronya and Sunday give a single ally an extra turn plus CRIT DMG — best for one hypercarry. Robin and Ruan Mei buff the entire team's damage — best for AoE/multi-source comps. Pick based on your carry.

Speed Tuning

An action-advance support must act immediately before her carry. Build her fast (often 134+ or tuned to the carry's Speed) so the advanced turn lands while buffs are active.

Stat Priority

Harmony wants Speed > CRIT DMG (for the buff) > Energy Regen. Effect RES also unlocks Broken Keel's team CRIT DMG. Avoid building damage on them.