Just tested with pally+bard.
lvl 2 pally is ESL 1
Add 1 bard ESL 2
At this point if I add 1 bard I get ESL 3, which is expected from adding a full caster class.
If I add pally there is no change to ESL.
So this is almost working the way it should work in tabletop 5e, which always rounds down. However, the single class half/third classes round up, so its surprising that half/third class combos round down. Personally, I think it should consistently round up or consistently round down.,
Shockingly, the BG3 wiki explains that half/third classes round up, unless ESL is concerned, when these are rounded DOWN.
