Yes. Those around Settra can use his higher WS, but would not choose to use his horrible BS. See the section in Magic Items on the Mummy Tomb King's Crown.

The wording in Arcane Magic is poor, so use the wording from the Warhammer Armies - Undead, and that is that Settra can use things that are Vampire, Necromancer, or Liche only.

(Vampire Only) does not equal (Vampire, Necromancer, or Liche only).

(Liche Only) does not equal (Vampire, Necromancer, or Liche only).

(Necromancer Only) does not equal (Vampire, Necromancer, or Liche only).

This means that Settra cannot have the Book of Nagash or the Carstein Ring. Settra can have Staff of Damnation, Talon of Death, or the Tomb Blade.

Unless a device specifically states that it does not affect undead, it does. This applies to witch elves poison, etc.

No, the allure of Slaanesh still affects them.

Yes.

Yes.

The undead general can still animate the army from the void, there is no tests for turning into dust.

Vampires are considered living in the respect that they can march move, and are not immune to psychology. Vampires are considered undead for all other things (such as Banishment spell and Runefangs)

Yes.

No. The Undead army book specifically states that wight and wraith champions can only be in units of skeletons, zombies and ghouls.

Although not weapon attacks per se, breath attacks are physical attacks, and therefore they would be immune. However, they should not be immune to 'gaze' attacks like those used by the Gorgon or Cockatrice, as these are magical attacks used in the magic phase. They would be immune to the following types of attacks: Dragons Breath, Greater Daemon Breath, Great Taurus Breath, Chimera Breath.

Yes.

No.

Because a unit is immune to break tests/psychology does not mean that characters in the unit are immune to break tests/psychology.

Therefore, if a wight, wraith, liche, vampire, or a necromancer is in a unit of skeletons and it loses a round of hand to hand combat, two things happen:

1. Extra skeletons in the unit die. If more than 1 skeleton unit is involved in the hand to hand combat, each unit loses an additional number of skeletons equal to the combat resolution.

2. Characters in the unit not immune to break tests, take break tests with the appropriate combat resolution modifier. If the character fails its break test, it is destroyed, flees, etc.

No charge was declared so the skeleton cavalry are stopped 1" away and can be presumed to have seen the scouts. They cannot pass through them. If the scouts don't charge or remove themselves from sight they can be charged next skeleton turn.

The controlling player can choose whether to leave it on the table (and only regenerate the missing parts or to summon an entirely new chariot.

Any unit that is considered undead (skeletons, zombies, mummies, carrion, wraiths, wights, liches, ghosts, skeletal cavalry, skeleton chariots) cannot stand and shoot or flee from chargers. This is due to the fact that they are just to slow in responding.

Yes, Ghouls have the capability to march move. Vampire and Necromancer characters can march move as well.

Unless a spell specifically states that it does not affect undead, it does.

No and no.