There is only one way to outsmart the heavens, and that is by using their own strength against them.
They planned on using the heavens' guardian to kill Klaus, since they knew the heavier and deadlier the spear gets, the more disadvantaged he would be.
Naturally, that worked to their advantage. Klaus indeed ended up in a situation where, if he didn't play smart, the crushing load of the spear would end him before he knew it.
The heavens' guardian was not affected by the pressure, so he knew he had to find a way to make sure they both were at a disadvantage.
Thankfully, his big brain worked everything together and came up with the best way to go about it.
First, he turned the ground into quicksand using his Earth elemental affinity. He planned to leverage the power of the pressure that would come from the fifth, sixth, and seventh spears and use it against the heavens' guardian.
