From about the last update, playing in Legend mode, there are some of the final events out of control.
Convocation of Decay - the final event suddenly spawns many stormvermins and at least 4 chaos warriors.
Athel Yenlui - in the final event swarms of many fanatics and many stormvermins at the 2nd-3nd alignment.
The Screaming Bell - the bell event spawns swarms, many stormvermins, and specials.
Fort Brachsenburcke - the final event is an endless sequence of swarms, fanatics, stormvermins, and specials. The final respawn area is a sort of deadly trap.
Empire in Flames - the final part of the barrel events spawns swarms of shielded barbarian, and at least CW after the explosion.
The Skittergate - in the final event, it is not rare that at least 2 groups of fanatics are joined to the party.
The Blightreaper - at the end of the final event, 4-6 chaos warriors are spawned.
Engines of War - into the skaven camp, the is an endless sequence of swarms, fanatics, and specials.
Enchanter’s Lair - the final fight is one of the hardest of the game with its endless sequence of chaos warriors (most of them shielded).
Dark Omen - this map needs a huge beastmen revision IMHO…
Try to think about the difference between the first ambush horde, and the following ones (much more harder).
The unreachable chaos wizards…
IMHO all these events need to be tuned to be challenging as much the map itself.
The ‘Enchanter’s Lair’ is a perfect example of an amazing & frustrating map, because the boss fight difficulty is out-of-scale compared with the played part (about 90%).