A lot of times, people take for granted that we already found a planet that is 100% compatible with Earth-based life, and we haven't even explored all of it yet.
Site-crawling can also be done improv-style. I just generally frame it as "Ok, who built this? What were they using it for? Who is living here now? What are they using it for? How does the old magic stuff interact with the new residents?"
Once you have an answer to those questions, it...
Personally, I don't consider Binder and the UA Vestige Warlock to have any sort of relationship other than the word "vestige" being used for both.
They're vastly different mechanical experiences with some overlap in narrative concepts, but nowhere close to the same overall concept.
Plenty of things can exist that are "modern" that were also experimented with earlier eras; they simply didn't become part of the mainstream definition.
B/X has a lot of contemporary respect precisely because it did something "modern" well before that practice became commonplace enough to be...
Realistically, day-to-day living should cause XP loss, proportional to the amount of total earned XP, representing the natural erosion of the edge life-or-death experiences give.
Training and practice can ameliorate this decline, but not arrest it.
In the context of "we're focusing on one big fight, not an attrition model", does a high level wizard having 5 5th level slots with 5 known spells for each big encounter work? I would say yes. Are there plenty of spells that would need to redesigned? Absolutely.
This seems like a change for...
I have done that, if they're really "crushable fodder" like kobolds. But I use these rules pretty often for 3-4 similar creatures, like a group of 4 ogres, more for pacing and ease of tracking than anything. It's easier for me track one pool of 200 HP than 4 different stacks of 50.
My house rule is slightly different (I think, I haven't read Draw Steel!) in that killing all the minions requires both a successful attack on each minion and the depletion of the entire communal pool.