How difficult DR/UT bosses are in surviving first 10 turns (or equivalent) without getting any tips on the first try
If you strongly disagree, then know that I imagined most fights (except Flowey) without any kind of healing too. Toriel is one of two exceptions and rated more on how difficult are her attacks than survivability. Asriel is the second exception, but adding phase 2 - he has to be placed a bit higher.
Credit to https://undertale.fandom.com/wiki/Toby_Fox for the images.
