Hi there, can anyone please explain how one goes about making a hydrus pet? Thanks. :)

When Merana randomly appears on the map, click her to begin the quest. You can join the "hydrus" ping group to get informed of the beginning of her presence, which lasts 12 hours. https://subeta.net/forums.php/read/869600/Merana-ping-group-hydrus

Thanks SO much! It's much appreciated.