What is the fine-grained topic of the following text: Once free, the player discovers the Praetor Suit, a very strong suit of upgradable armor, and embarks on a mission with the end goal of closing "The Well" a beam made of argent energy that keeps the portal between Hell and Mars open. Only return the topic.
Discovering and upgrading the Praetor Suit in a video game to close an inter-dimensional portal