More challenge for Ancient Cities, maybe a new Sculk boss

Ancient Cities are probably one of the most dangerous places to be in Minecraft, and probably anyone who plays Hardcore will think twice before enetirng one.

Other dangerous places, however, are all tied to a boss-mob: Nether Fortresses to the Wither, End Cities to the Ender Dragon, the Woodland Mansion to Illagers (and therefor Raids, which could be considered some kind of boss fight)...

So, it would make sense that Ancient Cities should have a boss fight. OK, they already have the Warden, which is a threat (a big one), but it's not a boss, since it's not meant to be fought, but he also can be found elsewhere, in the Deep Dark biome, not necessarily in the Cities.

So, maybe there could be some item, that paired with Echo Shards, could be used on the portal to lit it, and maybe a new Sculk-based boss could come out.

One problem that I see, is that how balanced should it be, since the Warden has 500 hp and deals 42 of damage with a punch and 10 with the sonic boom, so, maybe it could be a Warden-like boss, maybe with a name that gives meaning to the Warden being called...warden.

The drop may be something that interacts with Sculk and Wardens

Maybe, the drop could be something that interacts with the Sculk and the Wardens...