Lúkhag is Aighrig's bat, her companion and message-bearer in Elderslade. She has taken a liking to the dwarf Rékkur and to you.
Lúkhag is first met hanging out at Annâk-khurfu in Elderslade.
Lúkhag accompanies Aighrig into Câr Bronach, and can be found at the Trév Duvárdain outpost at Eiricháv.
Lúkhag is still following Aighrig, and can be found near her at Bail Avarc in the Ephel Angren.