The purpose of Dragon Shouts level 2 and 3

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I've tried using Ice Form shout level 2 (Slen) but I didn't notice any difference compared to level 1 (Iiz). Same goes for throw voice – it however has a lower cooldown, but I couldn't notice anything else. Can someone please explain? Why would I want to be spending Dragon Souls on shouts level 2 and 3?

Best Answer

Higher level shouts usually add more damage, longer effect durations, or more effects at the cost of higher cooldown. (more info here)

For ice form specifically, it increases the amount of time spent frozen and increases the recharge time.

              Effects                        Recharge
Iiz     Paralysis and 2 damage/s for 15 s   60
Slen    Paralysis and 2 damage/s for 30 s   90
Nus     Paralysis and 2 damage/s for 60 s   120

Each shout is different. Some are absolutely awesome at level 3 and lack luster at level 1. Look at Soul Tear for example.

               Effects  Recharge
Rii     Slight push     5
Vaaz    Slight push     5
Zol     Soul Trap for 2 secs on enemy, drain health 300 pts and reanimate body upon death for 1 minute.