Call of Duty Black Ops 3 Spider and Fly Guide, Widow Wine Grenade [Trophy / Objective]
How to make the Widow's Wine Grenade
Call of Duty Black Ops 3 "Spider and the Fly" Trophy / Achievement Guide
To obtain the Widow's wine in Shadow of Evil (it's actually a skill, not a grenade as written in the Trophy description) you need to open a particular gate in the Canal District. Transform into a demon to open the door shown in the video below, behind which will be the portal to the new area.
After going through the portal, kill the ghosts in the area and activate the power of the Widow's Wine machine.
Time you can buy the skill for 4000 points, which will allow you to throw special grenades that damage and slow enemies. Use this attack and kill 10 enemies that are under its effect to unlock the "Spider and the Fly" trophy. See also the video: