OchreJelly
First Post
This also has the effect of such magic being limited to combat use which can get boring quick. Charming someone for 6 seconds to preform very limited or prescribed functions turns what was once flavorful magic into just another form of attack.
I agree with that to a point. Shorter durations do limit what can be done with charm magic, but on the other hand they have opened it up with the amount of charm spells that are available (I include psion). Psychic damage, short durations charms for attack, charms that let a creature do anything but attack and so forth. These are inventive applications beyond just confusion and dominate.
If I were to create a longer term charm-type spell I would model it after the mind-flayer "create thrall" ability.
Basically you'd have to reduce the target to zero hps (with psychic damage would make the most sense). The target is then dominated (no save) and regains enough hit points to restore it to its bloodied value. You control the creature outside of combat for menial tasks. In combat the thrall uses your economy of actions to perform actions. Give it a new save each day or anytime it clearly violates its ethics (one check per encounter).