During the Rage of Demons, he succumbed to the madness of the demon lord Graz'zt until some adventurers (members of the Emerald Enclave hired by Elanil Elassidil to bring peace to the spirit of her ancestor Meira Faerenduil) confronted him.
In his madness, Brightleaf considered himself a god. He was wary of strangers but not hostile at first. He spoke metaphorically and painfully slowly in a rich bass tone, but almost never reached a point.
Brightleaf was an ally of the Emerald Enclave and had dealings with Serinia.