So you Thought You Knew it All?

She drank the elixir to stay alive
Her husband too, so did strive
She was, I must say, rather old
Now, you know that. Need you be told?
And he was (in Latin) Bumblebee's great friend
The same who took Grindelwald to his end
The final answer that you're searching for
Is a potion book's author.


Tell you what, just go by the last two sentences and you'll do it. There is a twisted way of getting to the answer too.

Answers after a week.