It is important, that immobilized targets are not always frozen. Frozen slows the target's movement, attack and casting speeds and it stacks multiplicative with other slow effects.
When Ice Brand procs, it deals ice damage to the target, but it can't proc if the Frozen debuff is not applied to the target. Burning deals damage over time, but it should not be confused by the damage over time effects caused by Magma Spear, Magma Mace, Firebombs or FIrestorm. When Fire Brand procs, it deals fire damage to the target, but it can't proc if the Burning debuff is not applied in the target. With it's impressive chance to trigger elemental effects, it's the easiest way to apply all three elemental effects required for prismatic builds.
On the other hand, it's an irregular one, instead of dealing the damage itself, it's nothing, but a simple trigger of three other skills. Prismatic Bolt is the main attack skill of the build. Main SkillsPrismatic Embermages have a strict base build, but they have a lot of free points for interesting additions and the class offers a lot of interesting addition! While embermages are all about offense with one very strong mobility skill, they have a very wide variety of that offense.
