Deafness or Being Hard of Hearing
Source GM Core pg. 22
A deaf character can't detect anything using hearing, critically fails Perception checks that require hearing, and is immune to auditory effects. These disabilities typically don't restrict their ability cast spells or use magic items, but if they perform an action they're not accustomed to that involves auditory elements, they must succeed at a DC 5 flat check or the action is lost. It's best to give them the Sign Language feat for free, and you might give them Read Lips as well. You might give one or more other characters in the group Sign Language for free as well.
A hard-of-hearing character might take a –2 to –4 penalty to Perception checks that are hearing-based. Like spectacles, corrective devices and augmentations for hearing are commonplace and accessible across the universe and can be found in most settlements or created on demand at UPB printing kiosks. Such corrective devices usually cost 5 credits and are available in a variety of forms. If the device is an augmentation, it doesn't count toward a character's implant limit. Likewise, if it's an armor upgrade, it doesn't occupy an upgrade slot.
A hard-of-hearing character might take a –2 to –4 penalty to Perception checks that are hearing-based. Like spectacles, corrective devices and augmentations for hearing are commonplace and accessible across the universe and can be found in most settlements or created on demand at UPB printing kiosks. Such corrective devices usually cost 5 credits and are available in a variety of forms. If the device is an augmentation, it doesn't count toward a character's implant limit. Likewise, if it's an armor upgrade, it doesn't occupy an upgrade slot.