Eula 
The Spindrift Knight, a scion of the old aristocracy, and the Captain of the Knights of Favonius Reconnaissance Company. The reason for which a descendant of the ancient nobles might join the Knights remains a great mystery in Mondstadt to this very day.
Consteallations
Tidal Illusion
Every time Icetide Vortex's Grimheart stacks are consumed, Eula's Physical DMG is increased by 30% for 6s. Each stack consumed will increase the duration of this effect by 6s up to a maximum of 18s.
Lady of Seafoam
Decreases the CD of Icetide Vortex's Holding Mode, rendering it identical to Press CD.
Lawrence Pedigree
Increases the Level of Glacial Illumination by 3. Maximum upgrade level is 15.
The Obstinacy of One's Inferiors
Lightfall Swords deal 25% increased DMG against opponents with less than 50% HP.
Chivalric Quality
Increases the Level of Icetide Vortex by 3. Maximum upgrade level is 15.
Noble Obligation
Lightfall Swords created by Glacial Illumination start with 5 stacks of energy. Normal Attacks, Elemental Skills, and Elemental Bursts have a 50% chance to grant the Lightfall Sword an additional stack of energy.