I remember hearing about theory somewhere that ExDeath may actually have been a reincarnation of Enuo.
Guido: About 500 years ago, an evil spirit sealed in the Mua Forest turned one
of the trees into a monster. The tree is Exdeath. For 500 years, I had kept
Exdeath sealed, but 30 years ago, the seal was broken.
The main concept behind the theory is that when Enuo was defeated 1000 years before the game starts, his spirit somehow ended up in the Mua Forest. It would then possess the tree that would later become ExDeath. The main problem with this theory however is that a villager in Mirage town gives us the following info on Enuo’s demise:
Villager: The evil wizard Enuo who tried to make the world his own with the power of the “Void”…he himself was sucked into the Void and disappeared.
As you can see, Enuo wasn’t sealed at all; he met his end at the hands of the Void. Unless someone can come up with a logical reason as to why he would then end up in the Mua Forest, this theory ultimately remains rather flawed.
The main points this theory has going for it is that it is chronologically possible (Enuo being defeated 500 years before ExDeath’s ‘birth’) and the fact that ExDeath and Enuo have very similar goals. ExDeath also seems to have a decent knowledge of how to obtain the power of the Void, something you would only expect Enuo to know.