Question

why did yam 'take the from of yakshr?​

Answer 1

Yama took the form of Yamaha because he was pleased with Yudhisthirs wisdom

Answer 2

Yam had from of yakshr in order to test yudhishtat’s knowledge . After the pandava’s took to reach for the mysterious deer , yudishtri came across the feed bodies of her brothers on examining closely he realised it has something to do with the crane that was lounging in the lake