Legacy Campaigns

When the level cap was raised to 80 with Undermountain, most old campaigns were awarded "legacy" status and not updated. I'm not sure what the selection criteria were, considering that the old Elemental Evil is still considered "current" while the much more recent Ravenloft has been designated a legacy campaign, but I'm guessing it might have simply come down to avoiding the hassle of re-scaling content where it would have been required.

With those old campaigns stuck at level 70, quests there can be completed with much more ease than previously now. To what end though? Cryptic were clearly asking themselves the same question and decided to add new weekly "legacy campaign quests" that ask you to either do quests, kill mobs or run heroic encounters on those old maps and that reward a special currency that can be used to purchase certain desirable items which were previously very hard to come by, such as companion upgrade tokens and high level enchanting stones.

This is one new feature I really love, as I'm both a fan of giving old content a new purpose and I really benefit from this new, more casual avenue to accessing those rare items.

All legacy campaign quests also reward currency for the campaign they are related to, plus bonus currency for a campaign of your choice (e.g. you could complete a quest to do Icewind Dale heroics and get both Icewind Dale currency as well as Chult tokens). This is useful to help get alts through campaigns you don't like as much and to get extra tokens that are required for stronghold upgrades.

I think this is really great design as it has also worked to greatly reinvigorate some of the old maps and especially the larger heroic encounters on them, which many people had previously lost interest in due to lack of rewards.