The +20% fear duration increase doesn’t work at all on my necro.
For example…
Reaper’s Mark fears 1 3/4 seconds long, when traited with Fear of Death. But when using Rune of the Necromancer the duration is still the same. Adding Terror makes fear do damage at the end of every second. For Reaper’s Mark it result in one time damage when at 1 3/4 seconds only. Combined with the Rune of the Necromancer should double the damage, but it still triggers one time only.
LVL80/Full Equipment: Warrior, Ranger, Necro, Mesmer, Guardian, Engineer, Elementalist
LVL2: Thief