The lightsaber fights are very intense often having characters in peril
A group of people are shown killed
This show isn't as violent or dark as it's predecessor (Star Wars: the Clone Wars), but it has its moments of being violent
Most episodes include fighting scenes, which include the deaths of many Stormtroopers. It is quick and nothing graphic is shown. In the episode "Path of the Jedi", Ezra has a hallucination where all of the rebels die, including Kanan being stabbed by the Inquisitor. It all ends up being fake, but is still really intense.
In the episode "Call to Action," two characters are executed via beheading by a lightsaber. The actual act is off screen, but their pained and surprised expressions can be briefly seen while the commander watches with a sick expression on his face.
Sometimes animals attack characters.