This is a check point. And no monsters can hurt you in here. Once you walk to the big fancy doors you will find a huge stone block. And on that huge stone block is numbers, and it is Hexadecimal code. You must figure out the letters of the two digit numbers, and it will say some like:

Replace all 8s with a 2, and then you must do that with the top numbers, and chat them. I personally love this code, and here is hexadecimal.
A—41
B—42
C—43
D—44
E—45
F—46
G—47
H—48
I—49
J—4A
K—4B
L—4C
M—4D
N—4E
O—4F
P—50
Q—51
R—52
S—53
T—54
U—55
V—56
W—57
X—58
Y—59
Z—5A
a—61
b—62
c—63
d—64
e—65
f—66
g—67
h—68
i—69
j—6A
k—6B
l—6C
m—6D
n—6E
o—6F
p—70
q—71
r—72
s—73
t—74
u—75
v—76
w—77
x—78
y—79
z—7A
20 means space by the way.