As the title says, I'm looking for a list of quests in Craglor that require a group of people to bypass the lock mechanisms. I've searched around for a bit but couldn't find anything concrete.
As far as I'm aware, it's only Critical Mass and The Missing Guardian which require a full group of four simply to deal with locks. The final boss in The Fallen City of Shada requires a group of 4 because you need one person on each platform to interrupt the Arch-Mages as they cast. The other Lower Craglorn quests can easily be done with a group of 3 if you're v11+, and some can even be two-manned if you have enough HP.
As for Upper Craglorn, I don't believe any of the quests require a group of 4, although some of the bosses are challenging and are best done with the standard Tank, 2 x DPS, Healer setup. The Truer Fangs and Iron and Scales are entirely overground (no delves) and so can be done with a Large group (more than 4).
Hope this helps!
Guildmaster of the UESP Guild on the North American PC/Mac Server 2200+ CP & also found on the European PC/Mac Server 1700+ CP
These characters are on both servers:
Alix de Feu - Breton Templar Healer level 50
Brings-His-Own-Forest - Argonian Warden Healer level 50
Hrodulf Bearpaw - Nord Warden Bear Friend & identical twin of Bjornolfr level 50
Jadisa al-Belkarth - Redguard Arcanist looking for a role