This will tell you when you have 26 seconds left on Crusade so you can get the max out of the Potion of the Old War. The reason of the 26 seconds and not the 25 seconds is because of the human response time. So to make sure, you won't spill any Old War dps beyond the Crusade. The Potion of the Old War will show up in a glow when you can use it. If you already used a potion in battle or a pre-pot went wrong, it won't show.
