completed a Drachhoath Ashen Immortal Empire campaign on Legendary/VH difficulty, and it was by far the most enjoyable experience I've had in the game. The campaign offers a perfect balance of challenge and satisfaction.
Your armies are formidable and packed with diverse units to command. Unlike some other factions, you can't rely on a single cheesy strategy due to the intricacies of armament/labor mechanics. This adds depth and strategic diversity to the gameplay, making every battle feel unique and engaging.
completely surrounded by an abundance of ferocious adversaries, each must be fought with a different strategy, the campaign throws you into a perilous situation, which compels you to adapt your approach to balancing war/economy/diplomacy accordingly. This constant threat keeps you on your toes and provides an intense sense of challenge. It truly feels like a grand strategy game that is the embodiment of Doom.
highly recommend

time sink as there is no real finish to it, great game thou.
a time machine that makes you suddenly find yourself still playing at 4 am.
mechanical wise, harbor and some character cards are too op, but without them the game is way too tedious.
AIs too, with more challenging AI, the game is insanely annoying due to constant harassment, if you buy them out or play with easier ones, the game will be way too autistic.
other than these cons, a five-star city builder game, might be the best yet.