Errata, Warlock quick build – Ray of Sickness is not a Warlock spell

Great Weapon Master feat, can I take the bonus attack on crit?

Hi guys, if I have the Great Weapon Master feat, can I take the bonus atk on crit or kill with one hander?

If a player has Polearm Master feat, but is using a spear or quarterstaff 1 hand with a shield, does the feat still apply?

How darkvision interacts with creatures that exploit dim light/darkness, can it still Hide/turn invisible?

Druid shifter: Lion only gets one attack per round, so can’t grapple and eat face?

Druid shifter question. Multiattack. Lion only gets one attack per round, so can’t grapple and eat face?