When an Aqua Support Trekker casts a Skill, or every 5s they are on the field, they grant 1 stack of Ripple Echo to the entire squad: Increases Aqua DMG by 2.5% for 6s, stacking up to 2 times. When a Trekker granted Ripple Echo triggers Aqua Mark, increases this Trekker's ATK by 5% for 10s.