Aaleear gain additional abilities as they advance in level. For every four hit dice (bard levels) they gain, the Aaleear also gains additional innate spells. At four HD, the aaleear gains charm person and invisibility, plus two additional level 2 spell slots. At 8 HD, the aaleear gains charm monster and improved invisibility, plus one additional level 3 spell slot and one level four slot. At 12th level the aaleear gains dominate person and a level five spell slot. At 16th level, the aaleear gains mass suggestion and a sixth level slot. These spells and slots are separate from those gained as a bard and do not combine.