Least Dragonmark( Eberron Campaign Setting, p. 56)
You have a least dragonmark.
Member of appropriate dragonmarked race and house,
You gain a least dragonmark and the use of one spell-like ability associated with the least dragonmark of your house (see the next section of this chapter for information on dragonmarks). A saving throw against your dragonmark spell-like ability has a DC of 10 + the level of the spell + your Cha modifi er. Your caster level for your least dragonmark spell-like ability is 1 + your level in the dragonmark heir prestige class (if any).