Great thread, and great responses.
Hi Parallelism, not sure if you're a video game player or writer. I write software, but I grew up on a farm, so I've been turning bolts for 40ish years now. The briefest-hopefully-relevant summary of what I've learned:
Protect your eyes and hearing. I have...
Looks exactly like the beam in my extended garage in my old house, supporting the trusses so the garage could have an addition. Probably a 4x12" wooden beam covered by drywall. I'd feel fine running some lag bolts into it, no worries.