A Murtlap tentacle is a rare potion ingredient that can be obtained from the growth on the back of a Murtlap. When a Murtlap tentacle is eaten, they heighten resistance to curses and jinxes, but an overdose has the side-effect of purple ear-hair. It could be used in the creation of the Murtlap Essence.
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Fantastic Beasts and Where to Find Them (Mentioned only)
- Wonderbook: Book of Potions
- Pottermore (First appearance)