TwoSix
Everyone's literal second-favorite poster
For tier 2, I tend to gate encounter-changing checks behind a 25, and at tier 3, at a 30. (This is for checks I "plant" in the encounter, if the players do something I didn't account for, I rule for DC based on the fiction.)Well, I guess I can try it. I like to keep DC's reasonable, and so far, the highest DC has been to try and open an Arcane Locked door (after which I realized that arcane lock is actually an insane spell- what's with all these spells that modify rolls and DC's by 10, anyways? Like say, the elephant in the room that I'm surprised hasn't come up yet, pass without trace).
DC 25 isn't particularly hard even at Tier 2; assuming the player has help to get advantage and guidance, a proficient character with an 18 in the relevant stat (so a +7 total) has a 47% chance to hit the check. Expertise bumps that up to a 66% chance.