In some settings you don't even need to step into the Underdark. Mindflayers, Drows and other things will attack and raid the surface...
Well. You yourself tell that location doesn't enforce you to be certain level, things you are going to be up against do. So I don't understand your problem with BG3 then.[/quote]
The location impact, but the adventure is more important IMHO. And fighting an mindflayer spelljammer ship who fought a draconic army doesn't seem a adequated adventure for a lv 1 char.
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It depend on how many kobolds you encounter, or in what circumstances. In a Critical Role they encountered a tribe of cobolds at lvl 7 (maybe 8). And were genuinely hesitant to start a fight.
On 5e, quantity is far more important than quality. If was on 2e, a single wail of the banshee could kill the entire tribe...
[quote=SorcererVictor](...) paladins etc venture into parts of the Underdark to make them safer? Say the Flaming Fist traced Drow slaver incursions down to a surface cave outside the Basilisk Gate. Do you not think they'd maybe send forces into the cave to bar passage and maybe create a base camp in the upper levels? And if your response to that is "No it's not possible" then you haven't paid any attention to what DnD actually IS...
Of course you can. But you got my point. The game starts with you escaping an mindflayer spelljammer ship who fought an draconic army.