As I write this guide, my character is currently at these stats and I can handle Survival Endless Spire on hard difficulty. It is fairly simple, but it does require a bit of healing as the time ticks away. Mostly around the 20-15 minute mark is when you need to pay attention to the health of your walls and towers.

Stats

The towers you will be building are
110 building units
Flame Towers – 4
Magic Missle Towers – 4
Barricades – 6
Sniper towers – 9


The placements are as follows

This build is very sniper tower heavy, the reason behind it is that they kill the mass of mobs from far away and by the time they reach your towers, it is a small amount of mobs and you can handle them easily. Simply place the towers according to the screen shots and have fun. Sometimes i run this in order to gear up alts or power level, it is also a good source of cash, if you loot everything, you end up with about 30k at the end.

Here is a map



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