However, I believe you've lost track of what you were trying to say in the first place." As if on cue, several laser beams flew right by your head, making you duck and cover out of shock and self-preservation. In retaliation, you witnessed Gilgamesh opening the Gate of Babylon and firing a volley of Noble Phantasms, taking down several ships in the process. All the while, the two of you were fleeing on a ship of golden light, just barely managing to stay ahead of the armada.
Actually, hold on a moment; this actually brought up a question to the forefront of your mind. Where did Gilgamesh get such a ship in the first place? And wasn't his treasury depleted in the Moon Cell? If that were the case, then how could he pull off what he just did?
When you bring up the question, all you get at first is laughter in response. Then, he replies back, "Did you really think I would allow the Moon Cell to retain that which is mine? As you were inputting your wish into the core, I was reclaiming the rest of my treasury from the Moon Cell. By the time you had finished and the Moon Cell had reached its verdict, I had attained what was stolen from me and defied the Moon Cell once again. The rest, you know all too well."
Well, that made sense; if there was any Servant who could defy and overcome the system so casually, it would be Gilgamesh. Having to lose his treasures to cross into the Near Side was a constant irritant to him, so when he saw the opportunity to fix it, he did so immediately. You suppose you should be grateful for that, chances are what he used to take you away from there was within the treasures he reclaimed. Though it made your assumption of him 'staring off as a Level 1 nobody' in this new world completely wrong.
"Ah, though that wasn't all I had done inside the core. Reclaiming my treasures was faster than anticipated, or you were slower than expected in making your wish; regardless, I found myself with ample time on my hands to spare. So, to deal with the tedium of waiting, I accessed the records on Heroic Spirits and compared their Noble Phantasms to the contents of my Gate of Babylon. Regardless to say, I already had them all within my vaults, even the god-killing spear of Karna was already mine. As is natural, for I own all the treasures of the world; all this did was merely help confirm the contents of my treasury.
Even so, there were some treasure of note within those records that intrigued me, so I took them with me. Really, even if I had their equivalent or superior already; they had an aesthetic that I found pleasing and desired to own myself." He explained nonchalantly, all the while pushing the ship you were on ever faster, racing against the fleet chasing you and clamoring for your destruction.
You, on the other hand, do a complete 180 in your head after hearing that. Thief! Looter! Like a magpie seeing something shiny in the distance, the King of Heroes couldn't help but take what caught his eye. Moreover, it was that kind of thinking that led to the current mess the two of you were in!