As a bonus action, you can magically turn invisible until the start of your next turn or until you attack, make a damage roll, or force someone to make a saving throw. Once you use this trait, you can’t use it again until you finish a short or long rest.
After using Hidden Step, does the invisibility goes away if I cast a spell to heal or buff allies?
Usually not. Only if it somehow causes damage or a save.
I see, well thanks.