The Jungle Dwellers defense

The Jungle Dwellers of the southern rainforests did not participate with the war, as they were the only tribes people that had a weapon that caused the new races to leave their lands willingly.  Because of their more primal lifestyle, they had found a way to take from the earth, air, water, fire, and even the soul.  With this magic, their witchdoctors were able to drive the men of the armies insane, and eventually caused them to leave, in a horrible victory that would always give both northern tribes and the new race chills down their spines.