There's a thread already about d20 and skill checks
Use searchThis is a copy/paste of what I said on the other thread.
BG3:
Based off BG3 you can't get any better than a 17 for ability score (doesn't matter if you have a +2, +1, or nothing), so ability modifier is going to be +3. There is no skill points in this edition only proficiency which can be gained via background, racial, or class. At level one for proficiency is a +2, generally any race/class can achieve this +5 right from character creation.
Leveling up you gain +1 ability score at: 4th, 8th, 12th, 16th, and 19th. Proficiency goes up by one at: 5th, 9th, 13th, and 17th.
level 1: Ability Mod:+3 Pro: +2 = +5
level 10: Ability Mod: +4 Pro: +4 = +8
level 20: Ability Mod: +6 Pro: +6 = +12
Social skill challenges don't normally go up, so the higher level you go the better you get at said skill. This also doesn't include spells or potions that can give you the upper hand at skill checks.
Now normally in a d&d game you don't cap at 17 so the ability mod for racials actually comes more into effect giving possibly a 18 or 20 ability score. Class features seem to be missing, off the freebe pdf you can get from d&d beyond rogues get a expertise feature at level one. Which doubles skill proficiencies for 2 skills or 1 skill plus thieves tools.
Probably more junk I'm missing but I hit my limit on researching. Over all you have a problem with BG3 and how they implemented the 5e rules, 5e rules period, or just d&d all together. I'd recommend go finding another game if you don't like the d20 system in d&d.
Edit* Oh I did forget about inspiration points where you can spend a point to give yourself advantage in a skill check.
Edit2* Digging through the PDF and looks like 5e does cap your ability scores at 17 at least for point buy (racial mods included) rolls still can be 18s, interesting
- option for static rolls, like in Divinity 2 OS, when the skill check is always the same and instead of rolling the dice + applying bonuses, only our bonuses thanks to proficiency selected during the creating (like +2 to persuasion rolls) and ability bonuses count. (levels could also play a part)
- option to reduce the rolls by dividing the difficulty check by 2 and rounding it down (same being applied to the roll), so that your bonuses due to having proficiency and ability bonuses + artifacts are felt as more powerful.
If DC is for example 15, our base chance to succeed is to roll 15,16,17,18,19,20 . (30% Having +3 bonus adds 12,13,14 to the list, increasing the chance by 15% to 45%.
With halved DC, and halved roll, we would need to get 7 or more, to succeed (out of 10). Base chance is 40%, with +3 from persuasion increasing it to 70%.
- same system as right now, to satisfy hardcore dnd fans.
- option for unlimited re-rolling of the DC
It's a d&d game, d&d uses d20, if you don't like it go play something else. Now I do know a lot of people asking for skill check modifier to be applied to your roll vs subtracting from DC. I'm pretty sure there was some major problems with this but I don't really remember off hand.
I'm pretty sure you said something about save scumming but I can't find it for the life of me. Anyway just encase, devs mentioned more favorable results if you reload multi times.
