Arcane Sigil

Arcane Sigil is an Armor prefix only available on Docents. It reduces the wearer's arcane spell failure chance by 5% or 10%.

Lesser Arcane Sigil
Reduces the wearer's arcane spell failure chance by 5%.

Found on:
 * Morleth's Docent

Note: As of update 17 (or possbily update 16) Arcane Sigil and Lesser Arcane Sigil are now considered Global Enhancement spell failure reduction, just like arcane casting dexterity or augment crystal 5-10-15% reductions. These global enhancements DO NOT stack with each other. Arcane Sigil no longer stacks with Lesser Arcane Sigil, nor they stack with Arcane Casting Dexterity. This essentially means, the lowest spell failure you can achieve with an adamantine body Warforged wizard/sorcerer is as low as 5% (Inscribed armor -15, Sapphire of spell agility -15) and that is by lvl 20.

Earlier Arcane Sigil And Lesser Arcane Sigil did stack for a 15% arcane spell failure reduction. They also stacked with arcane casting dexterity from ie.:seven fingered gloves. That was a total -25% ASF reduction. Whether this new system is buggy or a potential fix is yet to be comfirmed by devs.

Arcane Sigil
Reduces the wearer's arcane spell failure chance by 10%.