Hello Ellotris,
Respawn is completly Random, u have super low chance to make it spawn after killing any monsters inside gnomprona.
As higher is your hazzard higher is the possibility to make it spawn, only when u kill a monster.
Anyway, u got extremly luck to spawn it at hazzard one and i will explain it with imaginary numbers.
Imagine:
Hazard 1 - 0.000000001% to spawn plunder everytime u kill a monster.
Hazard 2 - 0.000000002%
Hazard 3 - 0.000000004%
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Hazard 10 - 0.0000002%
I repeat, this % is not true, im just trying to make u understand why u had extremly luck.
Maybe in hazzard 10 u need between 20 and 30h to get 1 plunder, while in hazzard 1 u need atleast 100 or 200h for get 1.
As u can see getting higher hazard will increase your possibilty to spawn another plunder but this is more dangerous and more challenging
I hope i helped you!
Greetings, Gleemody