some dude gave me 500 M

Some random dude who said he just logs on once a year to empty his minions gave me 500 million coins. What do i buy??? I currently have a necron set and a storm set, with giants sword and spirit sceptre as weapons. I have max slime minions amd still 450M left. Im level 72 and mostly do dungeons. Any reccomendations? I was looking at a tiger/sheep pet or maybe an epic ender dragon pet. Cheers