Works like this:
A: r
B: s
C: t
u
E: n
F: o
G: p
H: q
I: v
J: w
K: x
L: y
M: z
N: e
O: f
P: g
Q: h
R: a
S: b
T: c
U: d
V: i
W: j
X: k
Y: l
Z: m
1: 6
2: 7
3: 8
4: 9
5: 0
6: 1
7: 2
8: 3
9: 4
0: 5
Means: You can learn this code.
These aren't Thunk, try guessing anyway:
3 15 4 5 - A - 2 18 15 11 5 14
24 12 23 22 - I - 25 9 12 16 22 13
XLWV 3 YILPVM
Ultra-secret message (Thunked twice at different points, and use the above prisms in some manner at some point):
4 6 - 0 - 01 - 5 0 - 5 - 5 8 - 3 - 4 | 0 - 01 | 5 7 - 5 - 5 2 - 5 8 - 4 2 - 01 - 5 3 | 3 - 5 9 - 4 4 - 4 | 4 01 - 5 8 - 4 - 3 | 5 8 - 01 - 4 5 - 5 - 2 - 9 - 5 2 - 5 | 4 - 5 2 - 4 6 - 5 - 5 2 - 3 - 4 0 - 5 0 - 4 - 4 - 5 8 - 5 0 - 5 2
EDIT: Encryption on final message upgraded.