Siege Masters...how to get 500?

[Noname]

It simply takes time to rinse and repeat to get all the bots you need. The more bots you have, the more clear it becomes  which ones you get the least. For example: I have all the Rag bots but 2 now (86% total), Chosen Champions and Einherjar Pikemen. These happen to show up at wave 13 only. Other bots that are a pain to get are the Followers on wave 5 and Fire Jotnes, so I suggest targeting those over the rest.