Previously, the Amphitheater in Tomb of Annihilation didn't have a statblock for the King of Feathers, but instead simply used a T-Rex with a few adjustments, notably more HP, misty step at will, and some legendary resistance\actions : https://www.dndbeyond.com/sources/toa/dwellers-of-the-forbidden-city#13Amphitheater

At some point in the last month, a statblock was created for him: https://www.dndbeyond.com/monsters/king-of-feathers

This statblock lacks the legendary abilities of the creature, making it somewhat useless to DMs who would otherwise use it in place of the notes on the module page.

 Legendary resistance is not a legendary action. It is a monster feature.

Don't forget the summon swarm thing as a legendary action as well!

I misread, that, thanks for fixing up the page!

Quote from Stormknight>>

Quote from DxJxC>>

 Legendary resistance is not a legendary action. It is a monster feature.

I've compared it to Ancient Gold Dragon, which also has the same feature and placed it the same as that.

 It is correct now. It was listed as a legendary action (the actions that can be taken after enemy turns) and not as a monster feature.

sucks dnd beyond will not allow u to see it unless u have or buy the ToA from their site

Quote from Scarletsteam >>

sucks dnd beyond will not allow u to see it unless u have or buy the ToA from their site

 This will be fixed as soon as possible.

 These special monsters are being made for the encounter builder, and they need to get new share licences from WotC for them.

It’s been a few months, still can’t access that stat lock even though I have the book...

Quote from 2simpler >>

It’s been a few months, still can’t access that stat lock even though I have the book...

 It has been a few months since we've been granted access to those stat blocks if we have the book.

You own the book on DDB (not just the compendium)?