When preparing siege engines for a march, your engineers carefully check their trigger mechanisms to ensure that their shots will unerringly destroy all obstacles on the way to victory. Upgrading this Knowledge increases the offense of your siege engines during an attack.
| Level | Gold | Soul Shard | Time | Requirements | Siege offense during an attack | Influence | Hero’s Experience | ||||||||
| 1 | 115K | 22.5K | 44w 6d 00h 00m 00s | Siege offense against melee 1, Oracle 36 | 1% | 15.5K | 41K | ||||||||
| 2 | 175K | 33.5K | 66w 4d 00h 00m 00s> 1 Year(s) | Siege offense against melee 2, Oracle 36 | 4% | 35K | 51K | ||||||||
| 3 | 235K | 49.5K | 98w 5d 00h 00m 00s> 1 Year(s) | Siege offense against melee 3, Oracle 37 | 8% | 79K | 64K | ||||||||
| 4 | 295K | 73.5K | 146w 4d 00h 00m 00s> 2 Year(s) | Siege offense against melee 4, Oracle 37 | 13% | 180K | 80K | ||||||||
| 5 | 350K | 110K | 217w 5d 00h 00m 00s> 4 Year(s) | Siege offense against melee 5, Oracle 38 | 18% | 405K | 99.5K | ||||||||
| 6 | 415K | 165K | 323w 1d 00h 00m 00s> 6 Year(s) | Siege offense against melee 6, Oracle 38 | 25% | 910K | 125K | ||||||||
| 7 | 485K | 245K | 479w 6d 00h 00m 00s> 9 Year(s) | Siege offense against melee 7, Oracle 39 | 34% | 2.05M | 155K | ||||||||
| 8 | 585K | 360K | 712w 4d 00h 00m 00s> 13 Year(s) | Siege offense against melee 8, Oracle 39 | 45% | 4.65M | 195K | ||||||||
| 9 | 775K | 535K | 1 058w 2d 00h 00m 00s> 20 Year(s) | Siege offense against melee 9, Oracle 40 | 58% | 10.5M | 235K | ||||||||
| 10 | 1.2M | 4.63M | 790K | 2.38M | 1 571w 3d 00h 00m 00s> 30 Year(s) | 4 719w 5d 00h 00m 00s> 90 Year(s) | Siege offense against melee 10, Oracle 40 | 75% | 75% | 24M | 42.82M | 290K | 1.34M |
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