Fire From Heaven is a main quest under the Paris DLC of Assassin’s Creed Valhalla.
Your objective is to meet with Sigfred and seize a military workshop.
Here’s a walkthrough of Fire From Heaven in AC Valhalla.
To begin the quest, meet with Sigfred at the location marked on the map.
As you enter the tower, you’ll see many dead bodies. You will find Sigfred at the top of the tower.
After the cutscene, follow Sigfred as he leads you through the rooftops.
Then, head towards Defender’s Rest.
Eradicate the Frankish soldiers
Finally, you have to join him and the soldiers to defeat the Frankish soldiers.
After beating them, you’ll take over the area as the catapult base. The quest ends here.