Насчёт Death Сoil.
- Death Coil is a "horrify" effect (one of two horrify effects in the game, the other being a shadow priest's [Psychic Horror]). As such, fear countering abilities will not be effective against it.
- Most creatures that are [Fear] immune are also immune to Death Coil. This includes nearly all undead.
- It is a binary spell, and as such it can only hit or miss. Neither critical hits nor partial resists are possible.
- Typically, Death Coil is followed up with the [Fear] spell against melee attackers, especially in PvP as the short horrify effect will prevent you from suffering casting pushback or lose your Fear spell to an interrupting skill such as [Kick] or [Pummel].
А насчёт diminishing, то Patch 2.1.0 (2007-05-22): Is now subject to diminishing returns in the Horror category. Currently, only Death Coil is in this category.