Leonard is a character in BLACKSOULS. He was an archdemon with the title of Baphomet who had a very long battle with Dorothy until she made peace with Glinda. According to Dorothy, that happened many hundreds of years ago, she became a witch and decided to come back to the Sabbath only to see that it was destroyed.
Now the Black Trial dwells in the Forest of Sabbath along with plenty of demonbeasts.
Going further into the forest will lead you to a boss fight with the Nameless Demon, who Dorothy confirms to be Leonard if you summon her in the fight with him. Killing him will give you the Demon’s Catalyst, which is a very strong weapon.
There is 10 Candy, and Sorcery [Heavy Soul Discharge] in the bookshelves at the place where you fought him.
The Black Judge Baphomet requires you to kill him in one of her Black Trial quests. Dorothy calls the Black Judge Baphomet an “evil god” who took the real Baphomet’s identity, which explains well why Leonard is now just called “the Nameless Demon”.
It’s not exactly clear why that happened, besides the fact that Glinda summoned some kind of demons that were “not normal”. The world then started to break and the sky turned red, while Leonard was fighting the demons with no chance of winning.

