Dunadan

The Dunedain in our rule set are not a race; they're humans, who use their bonus feat to select Dunadan Blood at first level.

Dunadan Blood [Feat, Human]

Benefit: You gain a +2 bonus to your Charisma score, and can use power of the dunadan as a daily power
Special: This feat can be taken only at first level (using the bonus feat slot for humans).

Power of the Dunadan

Daily
Immediate interrupt – Personal
Effect: You can add your Charisma bonus to an attack roll, skill check, ability check or saving throw. You can choose to use this power after the roll is made, but before the result is announced.