Astarion's nature as a vampire spawn makes him one of the most interesting companions, but it also leads to a difficult choice when he asks to drink the protagonist's blood. No matter how fascinating this high elf rogue can be, turning over one's blood to a third party is never a comfortable prospect. This choice can have both upsides and downsides in, and it's best to have a thorough understanding of both of these possibilities before making a final decision.
Astarion's attempt to bite the protagonist can come as something of a shock, occurring in camp after a long rest early in the campaign. This may not happen at the exact same point in every playthrough, but encountering the exsanguinated boar in Act 1 is necessary to trigger the event. Astarion shows his capacity for aggression in the first encounter with the main character, drawing a blade and even putting it to the throat if the protagonist antagonizes him slightly, but the story event surrounding the bite still marks a major escalation from this incident.
Unfortunately, there's no completely safe way to accept Astarion's bite in . Astarion will attempt to drink more blood after taking a sip, and his success at this action can spell the protagonist's doom. Dice rolls are in place to save from the deadly outcome, but failing these rolls makes matters go south very quickly. The death of the protagonist at Astarion's hands won't immediately end the game, instead forcing the player to control the other characters in the party with the ability to bring back the main hero with .
The biggest reason to accept the risk of Astarion's bite in is to improve the protagonist's favor with the high elf rogue. Refusing the bite won't spell disaster for an Astarion romance in , providing only a minor setback, but accepting it is a good way to advance a bond. If Astarion's charms are proving irresistible either as a beau or simply a friend, letting him sink his teeth could be well worth the risk that it brings to the table.
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