The boss Ignaduk is immune to the Shield Charge skill

If you use Shield Charge against Ignaduk, it goes straight through her without collision. This happens with many flying enemies, but with Ignaduk it happens even when she is standing on the ground.

edit:

apparently her immunity isn't 100%, but the game seems inconsistent in detecting whether she is flying with her broom or on the ground.

+1 - sometimes Shield Charge goes right through her, other times it hits. It's especially dodgy in the first phase of the fight. I have not yet been able to kill her because of it.

For me she would also kind of glitch (Matrix-style) while she was on her bonestick. She appeared to teleport forward several meters. Maybe this is a server issue.