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GodGinrai He doesn't really reset to level 1, because every time he resets, his previous level gets added to the running total, which is now at level 70, and he keeps the stats of a level 70.
As a result, when he levels up from "1" to "2", he's really leveling up from level 70 to 71.
The first time we saw his stats, his effective level was 36, with HP 29, STR 23, AGI 18, WIS 9.
This time his effective level is 70, with HP 34, STR 40, AGI 39, and WIS 11.
On top of that, he's been accumulating a few skills and bonuses along the way.