It was one of the first major titles to fully utilize 3D hardware acceleration. This allowed for colored lighting, smooth textures, and high resolutions that were previously impossible.
The engine was designed to be easily modifiable, leading to a massive "modding" community that birthed entirely new genres of games. Narrative and Setting
Since you asked to "make a paper" regarding the 1997 PC game Quake II, I have prepared a comprehensive overview covering its technical impact, gameplay design, and legacy. The Legacy of Quake II (1997)