this is a condensed version of the lore I had in mind
A secret research facility deals in genetic mutations in order to make super soldiers but during a trial run things went wrong and a subject reacted to the mutations and went on a rampage tearing through the facility causing havoc. due to the status of the facility a “cleanup crew” was dispatched and upon entering the facility got ambushed by the subject and split up your team.
the idea is that the goal of the player is to regroup with their team and take out the subject who now controls a hivemind in the facility.