Venom Mist

Venom mist: [minor] by Iczer

'Breathe deep boys'

The character can affect a metamorphosis in his body, turning his hair into billowing green or blue vapours that surround him. For a 20 foot area around his body, targets are indistinct, and ranged attacks suffer a -6 to strike through the fog (close ranged melee attacks do not suffer any vision penalties though). X0ray vision, sonar andradar easilly penetrate this power.
More to the point, these fumes are toxic. Anyone inside the cloud must make a saving throw each round vs non lethal poison. A failure means a target starts to gag and choke on the vapours, suffering a loss of one action, and a -2 to all combat maonoevres for the round. worse, the acidic nature of the cloud inflicts 2D4 damage to targets, increased to 2D6 (+1 per level) if the target has exposed eyes, nose or mouth. It requires only the barest concentration to maintain this power. The character is immune to his own vapours, and has +4 to save vs toxins.