You are trained to attack with three arms at once.
Benefit(s): You can attack with a light or one-handed weapon in a third hand in addition to your normal attacks during a full attack (either wielding one weapon in two hands and another in a third hand or wielding a light or one-handed weapon in each of three hands).
This does not penalize you beyond the normal –4 for fighting with two weapons (or –2 if all your off-hand weapons are light). The attack with your third hand always counts as off-hand (applying only 1/2 your strength modifier to damage).
In addition, you gain a +1 shield bonus to your AC while wielding weapons in three hands. This feat does not allow you to effectively wield a single weapon in more than two hands. This feat’s benefit does not stack with Improved Two-Weapon Fighting or Greater Two-Weapon Fighting.
Normal: A gnorri can attack with no more than two arms during a full attack.
Sandy Petersen’s Cthulhu Mythos, © 2017, Petersen Games; Authors: Sandy Petersen, Arthur Petersen, Ian Starcher.