User blog comment:Kogath/Monster Hunter: World Discussion/@comment-6050823-20180322235419

Lagiacrus was in an earlier version of Monster Hunter: World but was ultimately scrapped, due to it not functioning properly in-game. Lagiacrus isn't planned for future DLC.

https://twitter.com/johntv/status/976962161116196864

https://twitter.com/johntv/status/976964586367676416