How do I reach the top of this tower with the Hallowed Health in E2M6: The Erebus Reactor?
So the solution is to leverage a mechanic I didn't even realize existed, crossbow jumping. If you aim towards the ground with a crossbow and then fire, it'll jump you up a short distance into the air. You can chain crossbow bolts together to eventually reach the top of this tower.
So what you need to do is to just to get right next to the pillar using one of the other two connecting girders you can actually reach, aim down with a crossbow, and then fire until you're high enough to reach the top of the tower.
Gif source.