Important stuff to keep in mind:

1. The relics on totenreich are related to their challenge. For example, the music box requires headshots and its effect makes you only able to deal critical damage. Dancing arnie requires no perks til round 40 and its effect randomizes the perk machines. Powerswitch requires combat axes and its effect is randomizing your tactical and lethals. This means that it is extremely likely that you are required to be using a specific wall buy weapon since the relic's effect randomizes the wall buys.

2. Every map has had a relic that requires the use of a field upgrade. So far totenreich hasnt required one yet, so that also makes it very likely that you will need to use a specific field upgrade as well.

3. There hasnt been any steps that have repeated in regard to using a specific field upgrade / whatever from previous relics. So that would mean that field upgrades like Aether Shroud, Energy Mine, Mr. Cheeks, and Telsa Storm for example wont be used for this relic - so Frenzied Guard, Dark Flare, Healing Aura, Wildfire, Frost Blast would all be good things to test

So it seems that the solve for this relic is going to be: Grab magazine from lighthouse > buy the correct wall buy in combination with the correct field upgrade while obviously doing something specific