Serum. M

After injecting this serum into yourself, you undergo a state of heightened adrenaline. For the duration of 1 minute, you have doubled speed and you can take a reaction on every turn of combat. If you are attacked during this transformation you have to roll a DC 10 Constitution saving throw. If this save is failed you drop concentration and immediately experience the after effects of the serum. This transformation ends at the end of your turn causing you to suffer one point of exhaustion and be restrained for one turn.