Black Ice
Source: Other. Since is a Toy in Legion, here's a quick guide for it: Simply enter Zul Gurub on Heroic Mode and right at the entrance will offer the prequest.
The 
Black Ice is a toy obtained by completing the quest Booty Bay's Interests inside Zul'Gurub, rewarded after defeating two bosses and Jin'do the Godbreaker.
Guide awaiting review
Enter Zul'Gurub
Travel to Zul'Gurub at 71.95, 32.91 in Northern Stranglethorn and enter the instance on Heroic Mode.
Pick Up the Quest
Just to the left of the entrance, find Overseer Blingbang at 71.95, 32.91 in Northern Stranglethorn and accept the quest Booty Bay's Interests from him.
Kill High Priest Venoxis
Locate and defeat High Priest Venoxis inside Zul'Gurub — this counts as one of the two required boss kills for the quest.
Kill High Priestess Kilnara
Defeat High Priestess Kilnara inside Zul'Gurub to complete the second required boss kill for Booty Bay's Interests.
Defeat Jin'do the Godbreaker
Head to Jin'do the Godbreaker's platform. Kite one of the four Gurubashi Spirit Warriors from the surrounding platforms onto the boss platform, then damage Jin'do to 1% health to trigger Phase 2. In Phase 2, pull a Gurubashi Spirit Warrior to a chain and let it jump on you — repeat this three times to defeat Jin'do.
Loot and Complete the Quest
Loot the quest item from Jin'do the Godbreaker, then return to Overseer Blingbang at 71.95, 32.91 in Northern Stranglethorn to turn in Booty Bay's Interests and receive Black Ice.
Tips
In Legion, Black Ice appears as a ring on your finger when used, granting a buff with infinite duration that persists through death — cancel the buff to unequip it.
If you sold Black Ice before it was converted to a toy, it is no longer obtainable through the original drop and you will need to re-run Zul'Gurub to complete the quest again.
See the video guide for a visual walkthrough of the Jin'do the Godbreaker Phase 2 chain mechanic.
