Fighter’s “Know Thy Enemy” let’s players learn the target’s level. Where’s that information located?

What counts as an object?

Does Protection From Good & Evil protect against a non-evil undead or a non-good celestial?

PHB states somatic component hand & material component hand can be same…

Does an ability that causes attacker to roll disadvantage need to be declared before roll?

When a devourer consumes a creature into its ribs, can it still attack that creature?