Destiny 2’s Season of the Haunted returns players to the massive Leviathan, with multiple regions to explore--making it perfect for Easter egg hunts. Opulent, golden Bobbleheads of Cabal Emperor Calus are scattered around the ship. At the H.E.L.M. by the Crown of Sorrow, you can check which Bobbleheads you need for your dignified effigies of Calus display.
Collecting these progresses the #1 Fan triumph under the new Haunted Triumphs Seal for the Reaper title. Players must collect all Calus Bobbleheads and display them at the H.E.L.M. to get the Eidolon Exotic Ghost shell.
The final Bobblehead is in a room you probably noticed in Sever - Rage and might have wondered why it was empty. In the last portion of the mission, you'll make your way through a big cylindrical vent room with stopped fans. Look up and to the left just past the second fan to find a platform you can climb up into, leading into a small storage room filled with crates--and seemingly little else. Check the back of the room behind all the detritus to find the final Bobblehead.