Speak to Erna Rübenfein in Avestreu next to the soldiers at the bridge before you go into Ferdock. Enter one of the following case-sensitive codes to get the Mask Of The Master, which has +2 Charisma. Note: Some codes are intended for specific pre-order or collector's editions.

3EXD6L
44SC2K
4X1W68
6LAM24
74ZUA1
84JDE9
9PQ1WC
9YF3LC
EFG65K
F4B7AY
F5ZHV7
G97LG1
H6V8WS
IM3Z91
J7FB8T
JK28AX
LK8J4X
MP97FR
N4DEL5
NB3DY6
P38FVQ
PY66M4
RBV38S
S35DF9
S3RBD1
T6FM9Q
TW5BCW
U8IS57
YAPL39
Z75MRG