15% protection buff

[Jairus980]

It clearly shows that it is armor buff and not damage reduction.
You can see your armor stat increase once you use this buff

As you can clearly see there is no 15% damage reduction elixir in auction. Just 25%

[Jairus980]

This is before the buff

[Jairus980]

This is after the buff

[Futumsh]

Looks like this is true - sometime in early 2018 they switched to being stacking 15% armor, but the name/description wasn't updated. I'll check with design and get it sorted out.