Thunder Shrine is the Boss level for the Sacred Mountain AreaCruel Mode
Starting Goods: 670
Allowed Towers: Archers, Barracks
Top Left: 30 Mountain Bruiser, 7 Witch Icer
Top (to the left): 8 Yetid, Mountain Yeti Chief (Boss)
Top (to the right) 3 Mountain Yeti
Top Right: 33 Snow Wolf
Top Left: 4 Mountain Leader
Top (to the left) 10 Snow Spirit Airship, 4 Sled Snow Spirit
Top (to the right) 5 Rogue Snow Spirit, 6 Flying Snow Spirit, 24 Snow Wolf
Top Right: 6 Elder Snow Spirit
Center: 48 Mountain Bandit
Top Left: 6 Snow Spirit Airship, 5 Ancient Mountain Yeti
Top (to the left): 42 Mountain Bruiser, 3 Sled Snow Spirit
Center: 24 Mountain Bandit, 4 Strong Man Corpser
Top Left: 10 Snow Spirit Airship
Top (to the left): 11 Yetid, 8 Mountain Yeti, 1 Mountain Yeti Chief (Boss)
Top (to the right): 10 Flying Snow Spirit
Top Right: 4 Sled Snow Spirit, 8 Witch Snower
Center: 3 Witch Icer
Towers / Skills Needed: Ballista + Explosive Shot
Tower Levels Needed: Archers Excellent-1-30, Barracks (probably possible with Ordinary-20)
Use Magics where all of the paths meet if the enemies start to overwhelm you there.
Move barracks rally point closer to where all of the paths meet as show in the Picture.
place all 4 of your heroes slightly below where all of the paths meet.
Always keep heroes below the place where the paths meet. Back the heroes closer to the exit if needed to keep them alive.
Upgrade the Original Archer to Ballista + 3 star Explosive Shot
When you have some extra goods, sell the top left barrack and replace it with an archer. Upgrade this new archer to Ballista + 3 star Explosive shot.
When you have some extra goods, sell the top right barrack and replace it with an archer. Upgrade this new archer to Ballista + 3 star Explosive Shot.
If you have extra goods after this, build an archer in the top left corner as shown in the pic.
Only if needed, upgrade the remaining 2 barracks.
This might take some luck. Dont worry if you can't get it on the first try.
If you still can't get it, upgrade heroes. Gunnar is a very good hero for this level.