For everyone asking how you get keys.
You don't obtain a physical key per say, rather, you get a rune from defeating champions in the dreadnaught.
Once you obtain this rune, you must get the required amount of kills to fulfil the rune.
Fulfilling the rune will grant you a random named key to use on the specified name chest.
The champions in the dreadnaught are totally random spawn.
Hope this helps.
English
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False, there is a way to summon the cabal champion, with a (pretty sure I know the name) cabal reinforcement beacon. To use it simply go into the crashed ship and turn left right after you enter