Does multiple instances of resistance become immunity?

Caster wielding two daggers is able to cast a spell requiring an S component?

Can Borngray move 15ft, Misty Step, multiattack, move 15ft away and use Shield spell if targeted?

Can Borngray move 15ft, misty step (bonus), multiattack (action), move 15ft away and use shield spell (reaction) if targeted?

If I cast Shillelagh on my quarterstaff and have Polearm Master, does the bonus attack deal d4 or d8?

If I cast Shillelagh on my quarterstaff and have Polearm Master feat, does the bonus attack deal d4 or d8?


Eldritch Knight and Arcane Trickster don’t use a spellbook