A Rainha dos Corvos, um patrono dos Arcanos Desenterrados, concede a um companheiro corvo que ajuda você com testes de Percepção enquanto está sentado no seu ombro.
While the raven is perched on your shoulder, you gain darkvision with a range of 30 feet and a bonus to your passive Wisdom (Perception) score and to Wisdom (Perception) checks. The bonus equals your Charisma modifier. While perched on your shoulder, the raven can't be targeted by any attack or other harmful effect; only you can cast spells on it; it can't take damage; and it is incapacitated.
Essa pergunta surge quando você precisa calcular a percepção passiva. Do PHB 175,
A passive check is a special kind of ability check that doesn't involve any die rolls. Such a check can represent the average result for a task done repeatedly, such as searching for secret doors over and over again, or can be used when the DM wants to secretly determine whether the characters succeed at something without rolling dice, such as noticing a hidden monster.
Here's how to determine a character's total for a passive check:
10 + all modifiers that normally apply to the check
If the character has advantage on the check, add 5. For disadvantage, subtract 5. The game refers to a passive check total as a score.
For example, if a 1st-level character has a Wisdom of 15 and proficiency in Perception, he or she has a passive Wisdom (Perception) score of 14.
The rules on hiding in the "Dexterity" section below rely on passive checks, as do the exploration rules in chapter 8.
Como o corvo aumenta a percepção e a percepção passiva, a percepção passiva do bruxo seria igual a 10 + WIS + proficiência (se aplicável) + CHA (bônus na percepção) + CHA (bônus na percepção passiva)?