Sacrosanct
Legend
Just like the title says. What material do you have from previous editions that you still find very valuable in your 5e games. I think what still tops the list for me are:
* 2e's Creative Campaigning guide. Info never gets old.
* AD&D Encyclopedia Magica series. Don't have enough magic items in the DMG? These books are a wealth of magic items, and super easy to convert to 5e.
* AD&D Rogue's gallery. 5e is pretty easy to stat out on the fly for low to mid level NPCs, and this book is chalk full of personalities. You really don't even need to adjust much to still have them playable in the 5e world.
* 2e's Creative Campaigning guide. Info never gets old.
* AD&D Encyclopedia Magica series. Don't have enough magic items in the DMG? These books are a wealth of magic items, and super easy to convert to 5e.
* AD&D Rogue's gallery. 5e is pretty easy to stat out on the fly for low to mid level NPCs, and this book is chalk full of personalities. You really don't even need to adjust much to still have them playable in the 5e world.