What? The level expedition 130 boss? How do I make 30k armour and 900 damage if I don't have any materials to forge Sebastianus?
It's a catch-22! I have gotten the majority of red items from the previous area boss Cassi. I win about 80% of the time against Callirius so I attack him whenever I have quests for him but most of the time am still hitting the Bank of the Thames boss.
Have you tried offering to pay other players on your server for the resources you need?