The Swords of Chult module introduced a new quality of life feature that I managed to miss completely until I saw someone bring it up in a random reddit thread: Signets of Patronage.
Basically these are tokens that you can craft with campaign currency once you have completed a given campaign and which you can then pass on to your alts in order to reduce the amount of time and currency it will cost them to complete the campaign, by doubling reputation gains and cutting the cost of most campaign tasks in half.
This is great because completing campaigns on alts is a massive grind (to be honest, it tends to be a massive grind the first time around, but we tend not to mind so much when everything feels new and exciting), and up until now Cryptic's only concession to this has been to give people the option to buy campaign completion with real money instead of playing. Yeah.
As someone for whom the latter is completely out of the question, I'm pleased to finally have an in-game way of speeding things up for my alts. Mind you, compared to similar features in other games, such as SWTOR's legacy perks, the signets' benefits still feel pretty anaemic, especially since they are single-use consumables, so you'd have to craft a new one for every single alt for every single campaign. Still, it's better than nothing.
I've crafted one for Storm King's Thunder and one for Cloaked Ascendancy for my rogue and we'll see how much of a difference it makes. So far progress feels quite swift, but then it always does in the early stages.