Heroic public events are triggered during regular public events. Completing a step or destroying items before the main enemy is killed will upgrade the event to Heroic. This will increase the difficulty of the event and also increase the level of rewards received at the end.
Glimmer Extraction
How to Trigger Public Event:
Instead of killing the Extraction Crew, target and destroy the small generators connected to the floating Extractor by beams of blue light. Destroy all three to activate the Heroic Event.
Heroic Event Objective:
Defend Glimmer - Stand in the Glimmer pile until the meter reaches 100%. An endless swarm of Fallen and bosses will spawn.
Ether Resupply
How to Trigger Public Event:
When the giant Servitors spawn into the map, focus on the smaller servitors buffing the larger servitors. Keep destroying the small Servitors until the Heroic Event begins.
Heroic Event Objective:
Destroy the Servitor - The objective doesn’t change, but the Servitor does become more difficult and will spawn tougher Fallen to defend it.
Weapons Exchange
How to Trigger Public Event:
Obtain the three Scorch Cannons surrounding the area, each of which is encased in a dome. As usual when dealing with a walker, attack one of its legs until it collapses and drops the orbs. Then when the orbs scatter grab them and input them into the shield generators. There are three shields, and two generators per shield. Use one orb on each generator to disable the shield. The Heroic Event will trigger when all three shields are down.
Heroic Event Objective:
Destroy the Walkers - A second Arsenal Walker will spawn in the area, defeat both of them.
Witches' Ritual
How to Trigger Public Event:
When you have defeated the Wizards continue to stand on the circles until the shields around the portal crystals (top left and top right by the portal) drop. Then when the shields are down shoot the exposed crystals.
Heroic Event Objective:
Defeat the Abyssal Champion - An Abyssal Champion will spawn into the area through the portal.
Cabal Excavation
How to Trigger Public Event:
A Thresher ship will appear at 50% when you stand inside the Excavator circle. The Heroic Event will begin when you destroy the Thresher before the meter reaches 100%.
Heroic Event Objective:
Eliminate the Excavation Valus - A Cabal boss will drop into the area which you need to defeat to complete the event.
Spire Integration
How to Trigger Public Event:
Surrounding the central spike in the area are three smaller spires. Find and stand in the circles for each of the three smaller spires to charge them to 100%. The Heroic Event will start when all three spires are charged.
Heroic Event Objective:
Hold Off Elite Vex - Keep the swarms of Vex away that spawn into the area for a set amount of time.
Injection Rig
How to Trigger Public Event:
During the battle with the first Scion the rig will begin to vent heat in an area-of-effect attack. Don't leave, instead stop the overheating by shooting the open vents until they break. At the second Scion, do the same thing to vents around the middle under the prongs. A vent will open at the bottom of the rig when you have defeated the last Scion, shoot it to unlock this Heroic Event.
Heroic Event Objective:
Defeat the Infiltrator Valus - Defeat the Cabal boss that spawns into the area.
Taken Blight
How to Trigger Public Event:
Instead of killing Taken, enter the bubbles of blight to receives a short 4-second buff called 'Blight Receding' which will enable you to damage the large Taken Blight orb in the center of the event. The Heroic Event will be triggered when you destroy the Blight.
Heroic Event Objective:
Defeat the Blightmaker - Defeat the Blight boss that spawns into the area.