Quicksilver Potion

This potion is brewed from the liquid metal found in the
lakes of Viscid Flux. When drunk before battle
commences, it imbues the user with lightning-fast
reflexes.
Once per battle, at the start of the combat phase,
you can use this potion. If you do so, in that
combat phase, the bearer (and his mount, if applicable) fight immediately instead of fighting
later in the combat phase.