What drawbacks do you see when replacing cover bonus with any adv/disav ?

Empowered Spell, it talks about damage mods. Does this work for Divine Favor healing spells?

Can you target someone being grappled with Otiluke’s resilient sphere?

Does Rod of Pact Keeper increase the DC of all spells if I am a Warlock/Sorcerer?

Does Zone of Truth work in combination with Speak with Dead?

Does Change Shape work same as polymorph spell?

Can you get a bonus to AC from either a magic shield or magic armor?

If a ghost possesses a magic-user, can it cast spells?