Yes, you can evade without attacks by using the potion. The only thing you could still be hit buy are AoE attacks or effects that have language like "all heroes ..." (like gremlin spines).
Strategic Variant wrote:
I think this operates like Shae's hiding ability because the wording is the same. The only way enemies can attack Shae while hiding is with AOE effects. I think that is detailed in another thread.
Invisibility is actually more powerful than Shae's stealth because it doesn't break when you take an action. Shae can't avoid reaction attacks because to leave the space she has to take an evasion free action, which reveals her and allows her to be attacked.