Question

Each Servant will have a Certain amount of both absorption & generation.

Archers & Riders have the highest absorption making them the most greedy.

Beserkers have the weakest absorption

Assassins & I believe Lancers have the highest star generation

Star absorption is the amount a servant wants stars. The higher this number is the more likely that servant will get stars on their cards so increasing this will pull the stars to that servant. Star generation is the amount of stars a card will make. If you increase this the affected cards will be more likely to produce crit stars