Dark Knight: Guide by Raenryong/Stun

Stun

 * Level 37
 * 25MP
 * Casting Time: 0.5 Seconds (1 second with Hasso/Seigan)
 * Recast Time: 45 seconds (90 seconds with Hasso/Seigan)
 * Fairly high enmity
 * Stun is an incredibly versatile spell, able to prevent both magic and TP moves (although the monster does NOT actually lose TP if you interrupt it -- it will attempt to reuse it, though not necessarily the same one!). If you are on "stunning duty" to prevent a certain magic/TP move, do NOT keep up Hasso and/or Seigan. 1 second may not be able to interrupt where 0.5 seconds can (especially when factoring in reaction times), and double the recast reduces the chance you can stop the magic/TP move occuring again.
 * There are two forms of stunning: reactive and predictive. Reactive means that you react to the monster readying/casting the technique, and then interrupting it. Predictive is a bit hard; I basically think "what is the very worst moment the monster could use "x move", and stun then. If the monster has just been hit by something that gives it a lot of TP, like a Barrage, then is a good time to Stun. This can be combined with Absorb-TP to delay the TP move and strengthen yourself.
 * Stun is also very good for keeping tanks alive; if a tank's shadows fall and they have to recast Utsusemi: Ichi, Stun is very useful for this. Even in a case without shadows involved, if a tank's HP falls to red, that Stun could give the healers time to react and save the tank. Do not underestimate the power of Stun.
 * If you are tanking with Seigan/Third Eye or Utsusemi, Stun can buy you valuable seconds until your next recast. Obviously if you are using Seigan/Third Eye you are dealing with double casting/recast time so factor this in to your tactics.
 * It is a good idea to have Stun on a macro, in case a linked monster begins casting an AoE spell or something similarly destructive.
 * I would highly recommend you keep at least 25MP so you can Stun at any time.