All 7 Uses

however
in
City of Lost Souls
(Auto-generated)

And it was her association with the Daylighter, however distant, that led to her eventual Turning.
Chpt 10

however = regardless of how
That reminded her that however much of his blood was poison, just as much was the same blood that ran in her own veins.
Chpt 14 *
Sebastian, however, had disappeared.†
Chpt 14 *

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.
However long it takes.†
Chpt 8
However, she only looked at him with her mouth tight.†
Chpt 13
However crafted, it will always be a cup until the Angel voluntarily pours his blood into it.†
Chpt 16
And I will have you by my side, however I have to force you to be there.†
Chpt 20 *

Definitions:

(1) (however as in: However, complications may...)
though (or another expression that connects contrasting ideas)

Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 exists, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrast and but.
(2) (however as in: However much she tried...)
to whatever degree (regardless of how much; or whatever unspecified amount)
(3) (however as in: However you do it, get it done!)
in whatever way
(4) (meaning too rare to warrant focus)
Much more rarely (and arguably incorrectly), however can be used to intensify the word how, as when one says "However did you find her?" Grammarians would suggest using two words for that usage: "How ever did you find her?"