Finding the Lightning Titan was both easy and difficult.
It was easy to find his Domain, which was basically the place he build over the last few tens of thousands of years.
The Lightning Titan lived by himself somewhere in the Universe, without a direct connection to him. One had to fly through space and enter his sphere. And that was where the problems started to occur!
First, Dilan had to find a Gate that lead him close to the Lightning Titan's Domain, then he had to fly through the space for a while and find a way inside his sphere.
The sphere was also one of his constructs. To put it simply, it was a self-supplying lightning storm that had been weaved together after it had covered a stellar system.