I'm Fewd! I stream every weekend and am always willing to help you out. Feel free to check me out or ask questions on Twitch, Steam, or Discord.
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Twitch Link: https://www.twitch.tv/fewd
Steam Link: https://steamcommunity.com/id/fewdpoonz/
Discord Link: https://discord.gg/Vt2KR3e
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Build Start:

1. Place the Strength Drain and Ensnare auras as close to the Crystal as you can towards the middle of the map.
2. Place 1 Shroom Pit on the Right/ Eastern sedge of the circle/ octogon that's under the Crystal. (shown above)
3. Place 6 Cloud Towers on top of the Shroom Pit as close together as you can. 2 of them face the Left/ West side of the map facing the corners but still covering the stairs. Then place 4 Cloud Towers facing straight to the Right/ East.
4. Place a Nature Pylon & Mushroom Spore near the Cloud Towers as shown above.
5. Place a Forest Golem on top of the Cloud Towers/ Shroom Pit as shown above.
6. Place a Gas Trap, Inferno Trap, Darkness Trap, & Oil Trap on top of each other on the Right/ East side of the crystal but a bit closer to between the stairs near the Forge. 
7. Place 2 1-DU Reflect Beams exactly as shown above. These will block Ogre Shots for your Towers.
8. Enjoy!

Key things to know for the build: 

• I typically start at Wave 22 with an Upgrader, a Range, Damage & Speed Summoner for the first wave to get every Tower and Aura fully upgraded before the first wave ends. 
• I use 4 Boost Summoners (Range, Damage, Speed, & Defense) for every wave after the first wave.
• You will likely want to use the Flash Heal ability (press 0) on any of your Summoners halfway through the later waves to keep the Auras going. (It will heal everything from any of the points you stand at.)