Lightning Blackjack adds a Lightning fee and a multiplier mechanism to the blackjack round. A multiplier earned on a winning score is saved for a subsequent round and increases a qualifying win there. This timing matters: earning a multiplier is not the same as receiving an immediate multiplied payment on the hand that earned it. The additional fee also means the cost of entering a round differs from an ordinary table.
To compare related live casino formats, read the rules of Free Bet Blackjack and Infinite Blackjack.
The library also explains blackjack choices and rule variations to help put these mechanics in context.
Source: published game information.