If a player is wearing Adamantine armor, do they still take critical damage while incapacitated?

Druid 5/Monk 4: Can she use Ki abilities while in Wild Shape?

Druid 5/Monk 4: Can she use Ki abilities while in Wild Shape (i.e. Flurry of Blows)? Using unarmed, not natural weapons.

if I cast a bonus action spell can I then cast Shield as a reaction?

Split enchantment and Twinned spell, can they be applied to the same spell?

Pal6/LoreBard6 Additional Magical Secrets…

Would a cleric need to make a perception check to locate an invisible creature to cast Dispel Magic?

How do you suggest handling the party gaining too much wealth?