Shadow Magic---Stealth

The Devil Magic Department would like to have a contest with the Holy Magic Department to become the first department of the Magic Lyceum. This is because they have the powerful "Stealth". With the help of Devil Crystal powder, one can flee very quickly after he casts Stealth.

1.You need Shadow SP to hide any army so that other players nearby can't find it. It can be used on any army.

2.It costs 30 Shadow SP each time.

3.It is effective for 10 minutes.