For the past two years, ever since Krune began to comprehend the Divine Sense Laws, his Spiritual Incarnation was unstable. With that, he wasn't able to take advantage of it.
Only now, when he had fully healed his Spiritual Incarnation, was he able to begin his plans.
In the meantime, his clones had been creating countless metal plates for the task at hand. After making a general estimate based on his current cultivation base and the potency of his Land Incarnation, they made a metal plate that was 90 meters in radius.
This was where the maximum potency could be established. A Land Incarnation was split into two regions, the core and the outer region.
A tenth of one's Divine Sense range conformed to the core region of the Land Incarnation, the area where it was the strongest and most potent.
At the God Core Realm, the range of the divine sense conformed to 900 meters. Hence, the core region of maximum potency spanned 90 meters.