You extend a psionic shield around your mind that acts as a protection against mental abilities aimed at your mind. Any psion attempting to use an ability on you that affects your mind must beat you in an opposed Psionics
skill check. The one with the highest success wins. Should you win, the ability is blocked and the PSI-points spent by the attacker are wasted. If they win, they penetrate the shield and the ability takes effect. The shield remains however and any subsequent attacks must also overcome the shield.
The shield must be raised prior to the attack, or you are at a -6 internal modifier on your Psionics
check against the attacker, because you are unprepared.
The shield lasts for as long as you are concentrating on it for up to a 6 hours.