What does the spell Vipera Evanesca do?

The Snake-Vanishing Spell (Vipera Evanesca) was a transfiguration spell that vanished snakes. As such, it could be used as a counter-spell for the Snake Summons Spell, the fire to snake spell, or likely any other spell that produced snakes.

Why doesnt Voldemort Avada Kedavra Snape?

Voldemort did not kill Severus by the powerful but simple killing curse because he realised that the Elder wand might recognise Snape as it’s master and refuse to harm him. Voldemort had already been in a situation where the killing curse had backfired on him and so was reluctant to take any chances here.

How did Voldemort handle Nagini’s attack on Snape?

Voldemort assumed that even though Nagini is the one killing Snape, the order was his, and therefore nothing would go wrong. He approached the situation in the best logical way possible. He was wary of the situation, because he had already been through a time when Avada Kedavra backfired on him.

Why does Dumbledore use his snake to kill Snape?

He uses his snake, Nagini, to kill Snape rather than any number of spells he knows. This allows Snape to live long enough to help Harry defeat him. Why?

What is the meaning of the incantation ‘Vipera evanesca’?

Vipera is a genus of venomous vipers, a type of snake. Evanesca likely shares its origin with Evanesco, which means “disappear” in Latin — Evanesca would be the imperative form of the verb, making this incantation a command for the serpent to disappear.

When did Harry Potter use the Vipera spell?

Harry Potter also used it while searching for horcruxes in 1997, vanishing a snake in his path. During the Ousting of Severus Snape, Professor McGonagall used this spell nonverbally, vanishing the snake that Snape had transfigured from her fiery offensive spell. Vipera is a genus of venomous vipers, a type of snake.