I’ve started running Curse of Strahd and have been having a ton of fun making wacky homebrew things for my party and tweaking the module. Unbeknownst to the players so far, I have made them all a secret Dark Power trying to use them to usurp Strahd and Vampyr, and they’re just waiting to offer their dark gift.
For example, I have a druid with some fire giant ancestry who loves Produce Flame and is their front line, so he’ll be offered a slightly weaker Rage with the Path of the Storm Herald desert feature to use once per long rest. The celestial warlock would get charges to boost his Eldritch Blast damage and some secondary healing in exchange for sapping his life.
Giving my players powerful upgrades alongside typical class advancement can make some encounters harder to balance around, but as long as we’re all having fun who cares about balance??
I enjoy helping others experience the first time wonder of discovery, even after years of playing. It’s why I play in a custom setting and regularly create new monsters, spells, subclasses, and magic items. So many people crave that moment of first contact, and I love to help them find it.
On the DM side of that, when there are new things for the players to find, I get to stretch the creative muscles that I thought I had lost for years. I get to challenge myself to create new, interesting, and balanced experience to offer up for my table.