is it illegal? to use

How do i add items into my game? i mean like mana pots they wont work
and how do i make the mana bar change like decrease when using an attack otherwise no matter what u have mana...

Not really.

well i mean is there like any copy right issues? or anything?

Nope. Just don't release it again and say its your own.
You can use the released sources as much as you want.

ok thats good thanks :)

Ofc it aint, and its only 1 source thats copy righted.
(will give you a ban if u try to post it here)