Blood Hunter-Mutant, level 18 feature lets you have a mutagen on at all times. What happens if you take it again?

You can download Blood Hunter class here:

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Is the second feature of the Healer feat intended to work on/revive unconscious characters?

If a College of Swords Bard has Extra Attack, can they use the same Blade Flourish option for each attack that hits?

What about a Zombie that is an undead corpse as a creature?

Wizard has a spellbook, would that mean it is free then?

If a Profane Soul Blood Hunter were to cast, could they activate Crimson Rite with the magically-created Shadow Blade?

Casting Entangle, cast on a point within range. We are on a boat…