Ruby Knight (Durahan/???)

Stats	Current	Gains	Gains(E-A)
Lif	129	3	C
Pow	137	4	B
Int	185	4	B
Ski	112	3	C
Spd	79	1	E
Def	147	4	B

Lifepsan: 460
Guts regen: 16 or 1.88 per second
Life Stage Type: 2
Extra attack: Jumping Stab
Drill: +1 Domino
Battle: Will

The Ruby Knight looks suspiciously like a Vesuvious (Durahan/Dragon). Same stat gains, lower than normal lifespan, low guts recovery and same life stage type. The ruby Knight is the only mystery mix Durahan to start off with an extra attack, but you could do better with the two below.


Shogun (Durahan/???)

Stats	Current	Gains	Gains(E-A)
Lif	95	3	C
Pow	137	3	C
Int	143	4	B
Ski	117	3	C
Spd	96	1	E
Def	166	4	B

Lifepsan: 540
Guts regen: 13 or 2.31 per second
Life stage type: 2
No extra attacks.
Drill: +1 Domino
Battle: Will

The closest match here to an existing sub-breed would be a Garuda (Durahan/Phoenix). This is quite a nice Durahan with acceptable guts recovery and the lifespan of a Mock.

Kokushi Muso (Durahan/???)

Stats	Current	Gains	Gains(E-A)
Lif	99	3	C
Pow	125	3	C
Int	87	2	D
Ski	178	4	B
Spd	88	1	E
Def	163	5	A

Lifepsan: 500
Guts regen: 11 or 2.73 per second
Life stage type: 1
No extra attacks.
Drill: +1 Domino
Battle: Gaurd and Hurry

The Kokushi Muso is a spot on match for a Metal Glory (Durahan/Metalner). Same stat gains, life stage type and just look at that guts recovery. Phenominal for a Durahan. Like the Metal Glory though, stat gains could be better. If your trying to decide on a mystery mix Durahan to raise, I'd say it's a toss up between the Shogun and Kokushi Muso.