A Necromancer player character, for instance, can be a superlative summoner that drowns enemies in tides of skeletons and flesh golems, or be specialized into a wielder of blood magic and debilitating curses.

Source: https://screenrant.com/diablo-4-beta-changes-launch-performance-classes-loot/

Once you learn the context that defeating Sin with the final summon only brings peace for a few years results in the death of the summoner, her attitude and actions through the game up until then suddenly take on new meaning.

Source: https://www.digitaltrends.com/gaming/best-final-fantasy-characters/

The Darkling, who is a shadow summoner, was formerly the General of the Second Army until it was revealed that he is the creator of the Shadow Fold and the evil that lives in the fold.

Source: https://collider.com/shadow-and-bone-season-2-trailer-teaser/