We really don't know a lot about these guys, which is a shame. They are, after all, long term slaves of The Makuta whom have been subject to uncountable atrocities in the process. We know next to nothing about their language, their culture, their religious beliefs or understanding of their cosmos.
Still, I think we can come to some conclusions about their overarching timeline sequence.
Let's get the easy one out of the way in the first post.
The Visorak were created by Makuta Chirox. He was, by all accounts, very pleased with this.
So. What in Karzahni is the Zivon?
For those who don't well remember; the Zivon is a massive scorpion Kaiju which has, on multiple occasions, devoured a majority of the Visorak Horde.
It is a Kaiju so powerful, so unstoppable, so irresistible, that even in a setting as saturated with OP super-warriors as Bionicle, in the tens of thousands of years that The Zivon has existed, the only way anyone has come up with to make it stop laying waste to everything in its path is by trapping it in an alternate dimension.
If “The Zone of Darkness” ever had native life in the past, it doesn’t anymore.
In canon, we are told that the Zivon is the "natural predator" of the Visorak. Now, we learn this long before we learn about the roll of the Makuta in the ecology of the Matoran Universe, and thus the distinctly a-standard way anyone in the setting would consider the concept of a "natural predator."
But suffice to say, by normal definitions the Visorak aren't naturally occurring. So what in the mind of Tren Krom is the Zivon?
Well as many of us will remember, Chirox has a rival.
A more talented, but also genuinely and dangerously unhinged rival.
As I have proposed elsewhere before; creating an enormous, invincible Scorpion Kaiju, which neither he nor anyone else can control, is precisely Makuta Mutran's style.
From this, we may conclude that the Zivon comes second in the timeline.
I found his body on the floor unconscious from him astrally projecting. What was I supposed to do? Not stuff his every orifice with angry, winged slimy eels?