Limited time special weapons

Powerful weapons but not op that can only be gotten on certain times
Like a special weapon that was designed to defeat a specific type or counter a specific weapon like emp
I feel they should be able to get on the first 5 days of every season of the year and go to me end of the year special topic to find out how it would go for that time
And to make it fair you only can have 4 of them in your inventory and 1 on a mech

That’s on what I already made special for what it does and for it states which I will give soon

no thank you
there should be no such thing as limited time weapons
just new weapon ideas