Jacob's discussion with Immortika lasted quite a long as there were simply too many things to cover and too many shocks for him to take, especially the truth that he was already within the Path of Legend.
As for how he ended up here or how it happened, he already knew it was Immortika's doing, and the cursed book's true abilities again shocked him.
The biggest change was naturally in Cursed Immortality itself. After completing the first phase, not only can Immortika now speak with him, but the previous summoning time limit was removed, which means he can now summon Cursed Immortality any time he wants, and there were no limitations on it.
The second change was also related to Cursed Immortality; the Infinity Pendant's inner space had been increased from 1,000 cubic meters to 10,000 cubic meters, which was nothing but good news for Jacob.