There is a lot of duelling with Death Eaters and witches and wizards. People are bloodied up, killed and injured. The part where there are a lot of dead bodies of favorite characters can be very emotional to viewers.
On the aftermath of the Gringotts heist, Voldemort is shown slaying everybody in the Gringotts lobby room for failing to stop the heroes, with lifeless bodies of goblins and humans strewn up everywhere around the room
A werewolf fatally mauls and feasts on Lavender brown before being knocked to the nearby ravine by Hermione
A man gets brutally killed by a snake (seen from behind a stained glass window). While nothing too graphic is shown we see the outline of the snake rapidly attacking the man till near death. You also hear the man make disturbing sounds of pain (grunts/gasps).
One of most disturbing and violent Harry Potter movies.
A character is burned alive
A character freezes before exploding... not buddy but we see them burst into blank dust
Some of the visuals are a bit frightening
There is surprisingly graphic and upsetting violence in this film. Beloved characters are shown being met with sudden and agonizing deaths; occasionally with bloody results and detail.