Terraria Armageddon?

GUYS HELP! i just went on the terraria server and EVERYTHING IS GONE! EVERY house is destroyed, the npc spawn blown up and has a continuous loop of fireworks! the only house left standing belongs to (probably the culprit) mamamarti or i think thats his name PLEASE HELP EVERYTHING IS GONE

 

alos, i found LUMINITE at spawn! that only spawns from the moon lord and we arent even in hardmode! obvious hackks

 

I thought the server was in hard mode

 

it isnt. someone made it hardmode, but they turned it back to pre hardmode. still, this is a major problem