Divine Might (XI), Promathia Phase 2 (Back when CoP was still fresh.), (XI) Bahamut v. 2 (XI), Thanatos (RO), Proto-Ultima (XI), Vol Dragon (PSO2), Provenance Watcher concept (XI). Xi may be a 'slow paced game' but the encounters worked very well for the style of game it was. It was a mix of scripted and a mix of variety depending, since most bosses switched their AI based on life %, in XIV everything is just a pure rotation.

Where's the desperation of a boss trying not to die?