As a new player to MO, but a veteran at games in general, spiritism in this game is the first time I find ANY kind of ability that does not offer the basic functionality of it easily, but which lets you acquire elements of it that you cannot use without getting the basic functionality. It is kind of game design basics that first you get to try that "oh this is what this thing is about," not like "here you can buy these spells which do nothing for you unless you find yourself a big guild and manage to kill a lot of hard bosses or invest ridiculous time to farm gold".
And then after this all work you find out that farming these spirits is not for you, then you have just wasted it all. Unfathomable design, which really is made worse by this game having so limited options for magery.
Also random cast interrupt chance on hit is an unacceptable mechanic for magic in this game.