The quality or state of being violent; highly excited action, whether physical or moral; vehemence; impetuosity; force.

Injury done to that which is entitled to respect, reverence, or observance; profanation; infringement; unjust force; outrage; assault.

To assault; to injure; also, to bring by violence; to compel.

The use of physical force to injure, damage, or destroy oneself, others, or property.

It's generally considered good form to flag stories containing extreme violence since it is a squick for many readers. The scale of violence will vary by the fandom (for instance, even the love stories in OZ might have a violent undercurrent).

Not only for generic mission-related stuff, but mostly when it was affecting the char's personally

Violence: The Roleplaying Game of Egregious and Repulsive Bloodshed is a short, 32-page roleplaying game written by Greg Costikyan under the pseudonym "Designer X" and published by Hogshead Publishing as part of its New Style line of games. Violence is a parody of conventional dungeon-bashing games, being set in a contemporary metropolis where player characters run from room to room killing the occupants and stealing their stuff. It is relentlessly user-hostile, taking time out to insult the reader wherever possible (it opens with the words "Welcome to Violence, you degraded turd"), and uses a mechanic whereby experience points can be bought for hard cash from the designer or publisher.

(Ho'oweliweli) Destructive energies in all forms.

the property of being wild or turbulent; "the storm's violence"

a turbulent state resulting in injuries and destruction etc.