similacrum as a caster

the way delirium monsters are designed is ridiculous, as a caster you cant do anything at some point, im pretty geared around 150 divs invested as a spark stormweaver, i delete every content with ease but similacrum, monsters that spawn are invulnerable until they get close to you and push you around at which point you are unable to cast, this should be reworked to a point where when the monsters spawn they could be damaged at the same second they come out, it is stupid in my opinion to let them have a free attack and knocback on you before you can do anything to them