Your 24th level fighter can cast 24th level rituals!
I've just been reading the Arcane Initiate feat and it seems to me that this is a vastly powerful feat when you then also take Ritual Caster. Your 24th level fighter can cast 24th level rituals! Or am I missing something?
The multiclass feats are powerful, in that you're much better off taking them than Skill Training if there's a skill you want that's a class skill for the other class (and you meet the prereqs), but they're not really unbalanced otherwise. I personally think Initiate of the Sword is pretty weak compared to the others (Hmmm...Sneak Attack 1/encounter or +1 to hit 1/encounter? Hmmm....), but that's just me.
The multiclass feats are powerful, in that you're much better off taking them than Skill Training if there's a skill you want that's a class skill for the other class (and you meet the prereqs), but they're not really unbalanced otherwise. I personally think Initiate of the Sword is pretty weak compared to the others (Hmmm...Sneak Attack 1/encounter or +1 to hit 1/encounter? Hmmm....), but that's just me.
Well the sneak attack one is a bit weak too given that you need to be using a light blade or xbow to use it. I'm not sure that any class other then rogue is likely to use that.
Joe the peasant farmer can cast Raise Dead, if he has a)a scroll, and b)Gold.
And since 'a' can be acquired with 'b', it goes to prove that mounds of gold solve every problem. Poor peasant Joe who will never have 'b' unless he goes out and slays the dragon.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.