YES.. in the ending of the first season, as part of the Happy Ending. A child character proclaims he's going to marry a woman who is at least 20 years older than him. It's weird!
In ep 3 a three-headed snake is shown severely injured with thorns in its eyes and one of its heads cut off, there is blood. A woman kicks it when it bites a child, but she heals it afterwards and tucks it into bed :)
There is an area filled with the frozen bodies of giant monsters, one of them is a giant spider. In one of Bojji's childhood flashbacks in ep 11 he looks at a spider sitting in a web. None of them are animated moving
Multiple scenes with large groups of snakes on-screen from ep 1 onward, as well as a giant multi-headed snake that talks. A snake bites a child in ep 3, but befriends him after.
Close enough - at the end of ep 20 an immortal character is defeated by being sealed inside a chunk of earth. you hear him screaming as it's happening to him
^ Ep 16, Timestamp 5:50 - 8:15. After the child is whipped their throat is slit. This scene is part of a minor character's backstory and can be skipped.
Ep 16 someone does, you hear it in detail but don't see it. This happens around 12:10-12:24, after Desha says the line "you're being enlisted into the Order of the Underworld".
Maybe at the end of ep 20. There's a scene where someone incapacitates an immortal character by compressing him into a small ball then essentially burying him alive, you hear him screaming while it's happening
the protagonist is deaf+mute and is mocked/underestimated/criticized for it by other characters. Episode 10 has a flashback to a younger character expressing explicit ableism but adults are attempting to teach him otherwise