Your main focus when upgrading will be the side lanes, You want to try your best not to upgrade anything but the walls in the middle because on the last round you will be selling it in order to build more Sky Guard Towers. When Betsy goes to attack the Royal Egg in the middle she is targetable and will take a lot of damage before coming back, Usually 1 Million or more if you are Nm4 geared. You will notice you have a lot of extra mana to use, You will use it to place as many Sky Guard Towers as you can on the back platform. Depending on the difficulty, You may need to have Frost Towers setup in the lanes, 2 on sides, 4 in middle.Setup 1 Sky Guard Tower on the Defender's Forge Platform and another on the Furthest back platform.Setup 2 Walls down the middle(Far enough so the curse wont affect what you have placed) followed by 3 columns of 4 mines and a Buff Aura from Monk.Use 7 Mines and 1 Wall on each side lane.Setup (Numbers are a rough estimate at the moment, Going off memory.) You will need to pay attention to the lanes, Purple is Magic Resist(Explosive Mines), Orange is Physical Resist(Elemental Chaos). Strategy Squire, Huntress, Monk & Dps Class (Apprentice needed for Nightmare) Required (WIP) Summons Wyverns from her location, and opens new Spawn Points on the map for Wyverns to enter.Places a curse on Heroes, forcing them to move away from turrets or take massive damage.2.1 Squire, Huntress, Monk & Dps Class (Apprentice needed for Nightmare) Required (WIP).