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Squire
Apprentice
Huntress
Series-EV
Monk
Summoner
Hermit
Warden
Guardian
Jester
Barbarian
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Build Details
| Hero | HP | Damage | Range | Rate |
|---|---|---|---|---|
| Apprentice | 0 | 7900 | 4500 | 4200 |
Build Status: Public
Difficulty: Ruthless
Game Mode: Survival
Hardcore: No
Ruthless: Yes
Mix Mode: No
AFK Able: No
Mana Used: 0
Mana to Upgrade: 0
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Build Description
Two mana chests gives enough to build everything and up the beam 3 times. Have just a TB out and upgrade the rest of the beam while boosting during the wave. Aim your chickens at the east crystal for the most part.

I also tried this with 3.7k Tower Boost instead of 7.7k Tower Boost. The combat time was just 2 and 3 seconds longer for the waves.
Remember to put your splits in during the middle of Wave 19 to get more Owls.