I’ve been playing for over a year now so I feel like I can have an opinion on who is the hardest boss alone and online. Ranking top being most difficult to least difficult.

Offline Patriarch - personally because I’m alone the patriarch only has one target and the minigun is defiantly the most efficient move as it’s the main way I get killed offline from the patriarch. Also the fact he can run away and heal means that either I will die or it will take a lot of time to beat him (suicidal or HOE)

King fleshpound - it’s only a bigger fleshpound but on harder difficulties the damage the boss does can make it difficult and also the laser is hard to dodge when you and KFP are not on the same ground. Also the quaterpoumds don’t help and can distract you from the fight.

Hans volter - Hans is not a hard boss offline as the tier 3-5 weapons do good enough damage even on suicidal and HOE, while also Hans not doing devastating damage it makes the boss fight easy and not difficult to take him down. Personally I think HOE the zeds coming in are more difficult than Hans himself. Have rarely died to Hans offline.

Abomination - not even a boss really only died twice ever and one was back when the boss was first released as I wasn’t used to the moves. But now he’s just a big bloat that can be easily evaded and the spawns are the only threat and don’t do any damage. It’s too easy to beat the abomination, even when there was two of them in a glitch it wasn’t hard. That was on HOE difficulty

Online King fleshpound - I don’t know the reason why he is so OP online maybe it’s because of the amount of damage it takes compared to one player offline. Because some players don’t learn KFP moves like dodging the laser by crouching or parrying, getting killed means there is less players and KFP has more health and damage due to more players making KFP in my opinion the hardest online on hardest difficulties.

Hans volter - same reason as KFP Hans has more health and more damage which makes him a bigger threat online as his charges and slashes give a lot of damage while also parrying will be a issue against Hans as players take full damage.

Patriarch - Surprisingly can be beaten easily if the players know what they’re doing even on HOE difficulties, smaller maps will actually be an advantage as the patriarch will struggle to evade the players while on low health. Trapping the patriarch by surrounding him will be the final blow as he can’t evade and he will not fully attack either.

Abomination - like offline he is too easy to beat as the boss is too slow and even when speeding up can be easily evaded.

This is my opinion on the bosses if anyone says the abomination is the hardest then I would advise you to switch to a scrubs game like any EA game ;)