I got rat king Reaper out of my first winter box. Like you said, rng. Event items have a seperate rng from the normal items though, so even if you get a normal legendary you should get an event one very soon
I got rat king Reaper out of my first winter box. Like you said, rng. Event items have a seperate rng from the normal items though, so even if you get a normal legendary you should get an event one very soon