English Standard Version
And when they have finished their testimony, the beast that rises from the bottomless pit will make war on them and conquer them and kill them,New International Version
Now when they have finished their testimony, the beast that comes up from the Abyss will attack them, and overpower and kill them.Catholic Public Domain Version
And when they will have finished their testimony, the beast that ascended from the abyss will make war against them, and will overcome them, and will kill them