Lvl1 poison takes 11 seconds to kill a wizard. That's basically useless on an unlurable cc.
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Upgrading poison makes a huge difference. Getting rid of the cc 5 seconds faster may not sound much, but every th10 know the difference 5 seconds can make agqinst infernos. This could mean 2 dead golems on single or 10 dead wizards or the damage a pack of wizards can do to your valks if they are grouped up.
In my opinion the level of the earthquake spell needed should be matched with the wall level. For example lvl1 can kill lvl7 walls with 4 spells, lvl2 kills lvl8 walls, lvl3 kills lvl9 walls, lvl4 kills lvl10 walls and lvl11 walls always take 5. This will increase the value of walls again. They cost a huge amount of gold and are worthless at th10.