List is comprehensive and alphabetical and may contain spoilers:

Racial and Religious
Religious Extremism
Genocide (mention of extinct elves)
Slavery (mention of slave trade - not rooted in race)
Eugenics

Mental Health
Suicide (mentions of past death)
Suicidal Ideation (mentions of past thoughts)
PTSD
Grief
Controlling Parents
Panic Attacks
Abandonment by parental figure
Nightmares about Traumatic Events

Disabilities
Brief mention of life changing injury (scars, some pain, and limited mobility)

Sexual Content
Explicit Sex
Sex Trafficking (not on page, no POV character)
Sexual Abuse (rape-not on page, no POV character)
Mutual dub-con (both partners influenced by outside forces)

Violence and Death
Blood
Death
Death of a sibling
Death of a child (past death mentioned as backstory)
Death of a parent
Death of a creature
Suicide of a parent (past)
Graphic deaths (beheading, crushed, fire, spine injury, suffocation)
Torture (mostly mental torture utilizing hallucinogens, some physical torture)
Physical violence (punching, hitting, etc)
Violence against children
Domestic abuse (non-POV character)

Other
Hostage situation
Underage drinking (by real world standards)