The phrase "You Are It" in the context of RS3 refers to a quest in the game RuneScape 3 (RS3). It is a specific quest in RS3 with guides and walkthroughs available for players, including Ironman mode-friendly guides. RS3 stands for RuneScape 3, a popular MMORPG game. There is also another meaning for RS3 unrelated to RuneScape—it is a powerful 3D finite element analysis software used for geotechnical engineering in civil and mining applications. However, in the phrase "You Are It RS3," it most likely refers to the RuneScape 3 quest called "You Are It." If the inquiry was about the quest "You Are It" in RuneScape 3, it is part of the game where players engage in exploration and activities as described in detailed guides and walkthroughs for completing it. If instead the question is about RS3 as software, it refers to a civil engineering tool used for 3D analysis of geotechnical structures.

Please specify if the question is about the RuneScape 3 quest or the RS3 geotechnical software for further in-depth information.