Your proficiency bonus increased to +3 at 5th level (saves, attacks, skills, etc.)
For Second Wind: When a character falls below ½ their maximum hit points, they can call on some inner reserves that drives many heroes to try and recover some. On your turn, you can use a Bonus Action and regain hit points equal to your highest Hit Die (if multiclassed) +/- Constitution modifier + you Heroic Character level. This does not count as spending a Hit Die to recover (as after a Short or Long Rest). Once you have used this ability, you must finish a long rest before you can use it again.
For Second Wind: When a character falls below ½ their maximum hit points, they can call on some inner reserves that drives many heroes to try and recover some. On your turn, you can use a Bonus Action and regain hit points equal to your highest Hit Die (if multiclassed) +/- Constitution modifier + you Heroic Character level. This does not count as spending a Hit Die to recover (as after a Short or Long Rest). Once you have used this ability, you must finish a long rest before you can use it again.