Rathalos EX

[kikix12]

Also, non telegraphed attacks are not new.

That's not the only thing about Rathalos that's not typical to the fight...

And I know that mechanic itself is not new. Neither that nor random attack targets. Except that they are usually used for individual attacks. If not, they are used on adds (like the The Final Steps of Faith trial) or in otherwise low-end content (Stone Vigil in hard mode dungeon).