While v1.3.5.3 specifically fixed crash issues and multiplayer bugs, it contains the core content introduced in the 1.3.5 update :
If you are looking for more recent content, the game has since moved to the era, which added massive features like the Deerclops boss (v1.4.3) and significant quality-of-life overhauls (v1.4.4). Are you trying to mod this specific version of Terraria, or
Terraria was a minor hotfix released on April 25, 2017, primarily focusing on stability and bug fixes for the larger 1.3.5 "Polishes and Fixes" update. Because it is a hotfix, it did not introduce new bosses or biomes but refined the features added in the base 1.3.5 version. Key Features of the 1.3.5 Cycle