I'd say most are just a tad bit OP. If you compare them to similar moves of other types, the existing moves don't have such excellent Power, accuracy, AND high chance of a status condition.
Pulse beam, to relatively equate to other moves would really be at 80% acc. (10pp if maxed out with PP Ups/max)
Void Strike- Imagine that move on a Bisharp or Weavile. Too strong for STAB and move priority.
Odd that a mental flare would use spc def instead of spc atk. Would really kill the balance if you put it on a pokemon as tanky as umbreon and several others. Exceedingly powerful, would break the meta.
Not that the vast majority of proposed moves in this topic don't suffer from being OP in one way or another.
Frozen Body- probably one of the most analogous moves are super power and hammer fist, but those have much higher power to go with a stat lowering drawback, but I can also see it as a move greatly benefited from a scarf or band for sweeping, with the defense lowering aspect good for balancing by allowing a certain vulnerability to priority attacks. The freeze rate seems a bit high and might be better balanced at 15 or 20%, but I can also see it as a possible benefit that is there to justify the stat drop and relatively low power. I feel this is your most interesting move here.