Levels

Lv	Cooldown	Cost	HP Buff
1	05:37:40	34,330 2,450	5000
	HP Buff: 5000
2	07:30:20	45,770 3,200	8000
	HP Buff: 8000
3	09:22:50	57,220 3,950	11500
	HP Buff: 11500
4	11:15:30	68,660 4,690	15000
	HP Buff: 15000
5	13:08:00	80,100 5,440	20000
	HP Buff: 20000

Required

Upgrade and unlock the following tech to research

Lv	Tech
1	Rampage: 2
4	Rampage: 3