Moonbeam struggles to huge targets, like the spider queen. Usually, when I click my moonbeam on an enemy, it centers it ON the enemy. When I use it on the spider queen, it places the beam on the edge of the queen's hit box, and the spell is wasted. She is outside of moonbeam's influence. I tried placing the moonbeam by clicking on the spider queen, I tried placing it under her feet, I tried aiming it at the ground next to her, where the circle would overlap. I made sure she was highlighted before placing it. It never matters where I place it, it always spawns in front of her, just outside of her influence.
...what give?