Guild Wars 2

If the Demonic Defiance trait is equipped, Embrace the Darkness when activated gives you Resistance, that’s working as intended, however if you instantly stow weapon afterwards, you don’t lose the energy cost related to it, it cancels the animation so it’s instant, and you can stack up to 17s of Resistance with no cost.

Edit: Bug occurs on every single stance, however some can’t be cast again instantly.