Hunter x Hunter Season 2 Episode 72

Meruem uses his final permissible En and enlightens his surrounding with that and approaches to Welfin who was not detected by his En earlier. Caught between the desire to live and avoidable death, Welfin finally utters the name of Komugi and the secret Shaiapouf was trying so hard to protect now is finally revealed with Meruem regaining all of his memories about Komugi.