There hasn’t been body horror like this since 2008. Three hours into Fallout: London , I wander through a rundown supermarket scrounging for canned goods and medicine to help me on my journey north. Things are going swimmingly.

Between checking shelves for food and medical supplies, I cut down the occasional oversized fly for some minor XP before noticing a small opening along the wall in the distance. I walk over, hoping to find a computer terminal or a freezer with even more rations to take with me. As I round the corner into the opening, what greets me instead is the absolutely enormous thorax of a creature I’ve never seen in my cumulative 300 hours of playing Fallout games.

I backpedal as it turns towards me and behold just how badly I screwed up. This is The Bloatmother. It’s five times my size and doesn’t look happy about what I’ve been doing to her babies.

I clumsily swap my switchblade for the 9mm pistol I found a few blocks away. I use the V.A.

T.S. to line up three of the 17 shots I have and fire.

The first two ricochet off its hardened body. The third finds flesh, but barely makes a dent in the beast’s health bar. The Bloatmother fires a volley from its pinchers, but before it can hit me I hit the pause button and walk away from my Steam Deck.

“Nope.” The Bloatmother makes the original Bloatfly look like a friendly household pet. Tense moments like these are the early highlights of Fallout: London , the ambitious unofficial Fallout 4 expansion from T.