"Built like a Siege Machine , the Mighty Yak has a knack for knocking down Walls it comes in contact with. It also flies into a rage if you knock out its companion."
| Level | Damage per second | Damage per hit | Damage vs walls | Hitpoints | Upgrade cost | Upgrade time | Pet house level required |
|---|---|---|---|---|---|---|---|
| 1 | 60 | 126 | 2,520 | 3,750 | N/A | N/A | 3 |
| 2 | 64 | 134.4 | 2,688 | 4,000 | 40,000 | 1d | 3 |
| 3 | 68 | 142.8 | 2,856 | 4,250 | 50,000 | 1d 12h | 3 |
| 4 | 72 | 151.2 | 3,024 | 4,500 | 60,000 | 2d | 3 |
| 5 | 76 | 159.6 | 3,192 | 4,750 | 70,000 | 2d 12h | 3 |
| 6 | 80 | 168 | 3,360 | 4,950 | 80,000 | 3d | 3 |
| 7 | 84 | 176.4 | 3,528 | 5,100 | 90,000 | 3d 12h | 3 |
| 8 | 88 | 184.8 | 3,696 | 5,250 | 100,000 | 4d | 3 |
| 9 | 92 | 193.2 | 3,864 | 5,400 | 110,000 | 4d 12h | 3 |
| 10 | 96 | 201.6 | 4,032 | 5,550 | 120,000 | 5d | 3 |
| 11 | 100 | 210 | 4,200 | 5,700 | 130,000 | 5d 12h | 7 |
| 12 | 104 | 218.4 | 4,368 | 5,850 | 140,000 | 6d | 7 |
| 13 | 108 | 226.8 | 4,536 | 6,000 | 150,000 | 6d 12h | 7 |
| 14 | 112 | 235.2 | 4,704 | 6,150 | 160,000 | 7d | 7 |
| 15 | 116 | 243.6 | 4,872 | 6,300 | 170,000 | 7d 12h | 7 |