A certain element within the character is amplified, raising that modifier for a short period of time. No modifier can ever go beyond +10.
Amplify (Element) I: Raise (Element) modifier by 1
Amplify (Element) II: Raise (Element) modifier by 2
Amplify (Element) III: Raise (Element) modifier by 3
Amplify (Element) I: (Element) 3
Amplify (Element) II: (Element) 6
Amplify (Element) III: (Element) 9
Each character's ER (Element) is raised by their (Element) modifier.