Template:Player-spoiler

Spoiler warning: Details about a player-created storyline, or information currently unrevealed about a character, follow. This template indicates that the content following is a spoiler of content that is created by a player. You can use this tag to indicate that information about your character or storyline should not typically be known by other characters. It is typically used in conjunction with the End-spoiler template. To use this template, type Player-spoiler before the spoiler content, then type End-spoiler after the spoiler content.

You may also want to consider the Spoiler template for marking spoilers of canonical content.