Levels

Lv	Cooldown	Cost	HP Buff
1	3 days 23:03:10	257,430 256,666	7500
	HP Buff: 7500
2	5 days 06:44:20	343,240 306,666	12000
	HP Buff: 12000
3	7 days 00:59:20	457,650 366,666	17250
	HP Buff: 17250
4	9 days 03:41:08	594,945 468,666	22500
	HP Buff: 22500
5	13 days 17:31:42	892,417 702,666	30000
	HP Buff: 30000

Required

Upgrade and unlock the following tech to research

Lv	Tech
1	War God: 2
2	War God: 3
3	War God: 4
4	War God: 5