Elder Scrolls Online antiquities leads locations and hidden entry relics are new things that have come with the Greymoor expansion. The new and fun Antiquities system offers players a minigame, where they first find a lead for an item, and then excavate it.
Imperial City has 2 very nice grindspots. Those 2 spots are basically the most efficient ones if you want to grind Championpoints up as fast as possible. Skyreach (Craglorn, No DLC required) Skyreach is one of the best grinding spots because it is instanced. Which means noone will steal your monsters!