some questions about Defeat the Undefeatable

-Is there a way to get Keys of Fearlessness besides the progress bar and microtransactions?

-Is it better it to save your Keys of Defeat for Chests of Triumph, or use them right away on the regular Chests of Defeat?

-Where are doll bodies supposed to drop?

-I seem to remember being told that the highest-damage weapon in the game comes from DtU event, but I haven't seen any sign of such. I take it I was misinformed or remembering wrong?

-Where does the Evil Eye pet come from?

-How do you make Nian Beast Doll Pet? When I put the doll body in the workbench it says it's not part of any recipe.

 

The weapon you're thinking of is from the Anniversary event.

The doll bodies should drop from the same boss on the last map. I don't know if they can drop from the bosses in the first Circus part (with the 4 bosses) or not.

You have to complete an achievement to make the Nian beast pet. I just figured that out last night, but you need to open 50 of the Chest of Triumphant. You can check in your achievements under the events tab.