What is the significance of lachuar

Lachhuar, also written Lachhaur, is significant in Jainism as a Jain pilgrimage site in Jamui, Bihar. It has many Jain temples and a dharmshala built for pilgrims. In the Śvetāmbara tradition, it is also regarded as a doorway to Kshatriyakund, which is believed to be the birthplace of Bhagwan Mahavir; some Jains even hold Lachhuar itself to be Mahavir Swami’s birthplace. ( betastate.bihar.gov.in)

If you mean the spiritual significance in one line: Lachhuar is important because of its strong association with Bhagwan Mahavir and as a place of Jain pilgrimage and devotion. ( betastate.bihar.gov.in)