Claim

Yes — if you have a card of the faction the Leader played you must play it (except you may play a Doppelgänger instead). (page 1)

If the Leader plays a Doppelgänger, you must follow faction by playing a Doppelgänger if you have one; the Doppelgänger counts as the faction of the first card. (page 1)

Generally yes: if the second player plays a different faction the Leader automatically wins the trick, unless a faction power (Doppelgänger or Knight) changes that outcome. (page 1)

Played Undead cards are placed face-up in the trick winner’s Score pile in Phase One; however, an Undead card that was the face-up middle card and is won still goes into the winner’s Followers pile. (page 1)

In Phase Two the player who loses the trick collects all Dwarves played that trick and adds them to their Score pile, while the winner takes any non-Dwarf cards played. (page 1)

The winner is the highest-valued card of the faction led (0 lowest, 9 highest); in case of a tie the Leader wins the trick. (page 1)