Larian Studios Forums Baldur's Gate III Baldur's Gate III - Build Discussion Loss to ESL from Fighter vs. Ranger

Effective Spellcaster Level, basically the frequency at which a class gains extra spell slots. Some gain new spell slots every level, some every 2nd level and some every 3rd level.

Quite useful if you lets say want to play a Paladin multiclass that can smite 16 times without long resting;