One of my players has made a Warlock. He can cast Shield from the Staff of Defense. With Mage Armor and Shield up he's got 22 AC... at level 3.
We are playing through the Mines of Phandelver and nothing is able to hit him. He's owning everything hard.
How I can go about getting through that defense?
I had the party (all lvl 3's) get ambushed by one of the doppelgangers buffed with an Evil Mage spell list along with 4 Bug Bears and they couldn't make a dent in him. She cast magic missile and could not hit due to shield.
Ultimately I am curious: how I can adjust the difficulty more appropriately so that these guys are challenged enough? Adding more monsters doesn't seem to be working they are mowing everything down fast.