This equipment increases experience earned and damage done against any creature that gives Prayer experience through an ectoplasmator. However it does not work for creatures that are triggered via attuned ectoplasmator only, e.g. abyssal demons. This increase is 3% with one piece, 6% with two pieces, and 10% with three or more pieces of the set. Below is a list of monsters that are affected by this set effect.
Previously, if this armour was worn on member worlds at level 70, it would lock to that tier, making it unequippable on free worlds. After an update, it will now revert to level 50 when worn on free worlds and back to level 70 on member worlds.