Although you are not a recognized member of one of the dragonmarked families, you have manifested a dragonmark. Aberrant dragonmarks are mutations that appear occasionally among the dragonmarked races (usually to those not of a dragonmarked house) that can be traced back to the blood lines of corrupted dragonmarked families eliminated in the War of the Mark. At a quick glance, an aberrant mark could be mistaken for an established dragonmark, but on close inspection its differences are readily apparent.
Prerequisite: Dragonmarked race (human, dwarf, elf, gnome, halfling, half-elf, or half-orc).
Benefit: This feat provides you with a single dragonmark spell-like ability that is not directly tied to the trueborn dragonmarked houses. All aberrant mark spell-like abilities can be used once per day.
When you select this feat, you must choose an aberrant dragonmark spelllike ability from the following list. A character with one of the true dragonmarks (least, lesser, or greater) cannot select this feat, and a character with this feat cannot later select one of the true dragonmark feats.
A saving throw against your aberrant dragonmark spell-like ability has a DC of 10 + spell level + your Cha modifier. (Spell level for an aberrant dragonmark ability is always 1st.)
Your caster level for your aberrant dragonmark spell-like ability is one-half your character level.
Aberrant Mark Powers: burning hands, cause fear, charm person, chill touch, detect secret doors, feather fall, inflict light wounds, jump, light, pass without trace, produce flame, shield, Tenser’s floating disk.
Source: Eberron Campaign Setting
For feats that enhance your aberrant dragonmark ability, read the aberrant dragonmark entry.