Enbies and Gentlequeers, may we present to you: the USB-C killer five thousand.

No power delivery, no negotiation, just 12V straight to VBUS

You surely wouldn't regret having a USB-C plug with 12V on VBUS around.
@derf i don't understand electrical stuff well, my iphone charger says the basically the same thing, "output: 5V or 9V or 12V"
how do you know this one's a killer
@batterpunts Typically, USB-C PD devices negotiate the bus voltage – they get 5V by default and may request 9V, 12V, 15V, 20V (or other values in more recent versions of the standard). Crucially, some devices only support 5V and will fail and possibly burn when exposed to higher voltages.

Those devices will never request more than 5V, but if a power supply delivers 12V regardless, the magic smoke is sure not going to go back into device once it's done smoldering.

@derf ah, thanks, the crucial word on my adapter is "or" :D

i would like to leave you with this beautful page, if you don't know it already http://www.fiftythree.org/etherkiller/

The Etherkiller