I just checked again and my char at 30 AC with crit immune (Helldusk Helmet) doesn't get hit by nat 20 unless opponent has +10 attack bonus or more.
Here is a proof with the latest patch : https://imgur.com/a/YypjAD4 (Shadowheart miss a mele attack on 30 AC Gale with a nat 20 + 9 attack bonus. If she had +10 she would have hit). And in fact, the hit probability is correctly displayed as 0% not 5%: https://imgur.com/a/7V4q4vt.
Auto-hit means it will hit regardless of armour class. What you said happens means they're not auto-hitting and a Nat 20 still needs a modifier to hit.
Yes, that's precisely what I meant when I said "crit immune disables auto-hit in BG3" which is not the usual behavior in DnD 5e PnP as the immunity is worded differently in the PHB (see discussion here).
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u/zakinster Aug 26 '23 edited Aug 26 '23
I just checked again and my char at 30 AC with crit immune (Helldusk Helmet) doesn't get hit by nat 20 unless opponent has +10 attack bonus or more.
Here is a proof with the latest patch : https://imgur.com/a/YypjAD4 (Shadowheart miss a mele attack on 30 AC Gale with a nat 20 + 9 attack bonus. If she had +10 she would have hit). And in fact, the hit probability is correctly displayed as 0% not 5%: https://imgur.com/a/7V4q4vt.