[Slenderman - Doctor]

Originally Posted by Captain Harkness

the magic potions were really bad and served no purpose as i imagined he'd have just poured himself into the ring like with the fob-watches. I think the idea of th potions was something like what ten did with the cuppa tea and the eleventh with fish custard.

The fish custard/cup of tea made sense though. Eleven was finding out his tastes whereas Ten just needed something strong to perk him up.

The Master needing "The Secret Books & Potions of Saxon" was just cringe-worthy nonsensical Harry Potter rubbish.