From Legacy Wiki
Battle Clinic
Battle Clinic is a feature that is available only to subscribers. If you have subscription time, you automatically get access to it in your subscription control panel. It is only used to test stats and outcomes of the fights. Note that this place is unavailable on Dev Server.
Here is a picture of how it looks like:
How to use
To find out the outcome of any fight, simply fill in every blank space with appropriate number of stat points. The outcome will look like this: