You can fight with boss every day only one time.
You cannot fight with boss eaven if you lose.
Any drop from boss have 3% chance.
You must complete the obligated boss of the tribe to get to the last boss.

Boss Name	Boss Level	Exp	Health	Loot
Zabuza Defender	50	50.000	5.000
Haku Defender	100	100.000	10.000
Kimimaro Defender	150	150.000	20.000
Orochimaru Defender	200	200.000	30.000
Yamato Defender	250	250.000	50.000
Danzo Defender	300	300.000	100.000
Kisame Defender	350	350.000	200.000
Hinata Defender	400	400.000	300.000
Neji Defender	450	450.000	400.000
Choji Defender	500	500.000	500.000
Menma Defender	550	550.000	600.000
Minato Defender	600	600.000	700.000
Nagato Defender	650	650.000	800.000
Gaaara Defender	700	700.000	900.000
Obito Defender	750	750.000	1.000.000
Shisui Defender	800	800.000	1.200.000
Itahci Defender	850	850.000	1.400.000
Madara Defender	900	900.000	1.600.000
Sasuke Defender	950	950.000	1.800.000
Kakashi Defender	1000	1.00.000	2.000.000