Hi guys

I wanted to know what's the strongest monsters in your opinion

For me, (not sure about is name in english) the worm who do additional damage to poisonned characters is really dangerous, and the mountain giant is pretty dangerous too.

For Nemesis, Valyndra is the best by far imo.

In term of "non héroic" monsters I don't really know which one is really op

(I'm french, forgive me about my english)

I agree about the Carrion Worms. They are a top priority for defeating.

I still haven't faced Vallyndra.

Carrion Worms but sometimes Changelings can be a huge problem too (Valyndra's scenario for exemple). Valyndra was not the toughest Nemesis to take down for me, she was pretty easy but add some Changelings and then it starts to become a bloody mess for heroes.