So, I’m assuming this is a known issue/feature but, as per Poseidon card:
All allies resist new effects that block usage of Special Skills for 3 turns
Now, the wording means - to me - that Poseidon’s buff makes his allies resistant to stuff like silencing or mindless attack, but…
It blocks Hel/Proteus managain eraser too.
I get that not gaining mana has consequences, but this is a legit stretch: it’s not like Hel prevents an enemy whose mana bar is full from firing.
At the very least the wording is unfit.