Blue Ringed Octopus Bite
slate.com, Tiny Fox Lab

There is no antivenom for a blue-ringed octopus bite. However, if you can get a ventilator to breathe for you for 15 hours, you survive with no side effects.Tiny Fox Lab Facts

Preview photo credit: slate.com
Source: https://slate.com/technology/2015/06/blue-ringed-octopus-venom-causes-numbness-vomiting-suffocation-death.html