Stealth ????

[Toxic 1nferno]

Whats this stealth magic mentioned in the guide as i havent unlocked it yet and i am on mission 11, i may have missed the screen telling me i have it, can sum1 tell me the button command or it is a glitch in the game,

the only 1's i hve are magic arrows - shield - the fire thing - and telekinises,

Cheers Toxic