Don't forget there's Clarion Partial Core Invocation which is one of the destiny incarnate powers that gives at least mag 6 or better mez protection for 120 second with a 120 seconds cooldown and it's only tier 3 Destiny to, you will need to level to 50 and unlock them however. Another option is a /traps /sonic or /forcefield corruptor which all have some kind of power that as some protection to.