I'm a magicka dragonite thinking of switching to the Thief mundus stone for higher crit. However I'm not sure if DoT's crit, if it does for some spell then if people could tell me for which of the skills I use that will be great. I use the following DoT's:

 Destructive Clench (morph of Destructive Touch | Destruction Staff skill line)
 Flames of Oblivion (morph of Inferno | Ardent Flame skill line)
 Fire/Elemental Ring (morph of Impulse | Destruction Staff skill line)
 Structured Entropy (morph of Entropy | Mages Guild skill line)
 Engulfing Flame (morph of Fiery Breath | Ardent Flame skill line)
 Burning Embers (morph of Searing Strike | Ardent Flame skill line)
 Eruption (morph of Ash Cloud | Earthen Heart skill line)
 Scalding Rune (morph of Fire Rune | Mages Guild skill line)