Two new ability scores to consider in your OSR games.
Characters with an awareness score of 14 or better may add 1 to their chances of locating traps, doors, hearing noise and similar tasks. For example if the task would normally succeed on a D6 roll of 1-2, it will now succeed on a 1-3.
Characters with an awareness of 16 or better are only surprised on a roll of 1, though the rest of the party may be surprised normally.
Particularly strong willed characters may shake off mental intrusions. Any charm, hypnosis, confusion, insanity or suggestion may be shaken off unless the source was divine in power. The percentage chance is the willpower score itself. One attempt is made immediately, and another attempt can be made daily.