Faction Assault
Faction Assault events provide more chances to Delve in a Faction, earn extra Renown and other Delve Rewards.
Overview
Faction Assaults are a strategic game mode. They are a great way to permanently increase your Renown and Treasure Hoard Quality and earn more resources by accumulating points. This Live Event offers more opportunities to Delve without affecting your normal daily Delve attempts.
You can find the Faction Event by opening the Games menu on the World Map and selecting Faction Assault.
The first battle of every Delve attempt in the Faction Assault costs 1 Sigil to play, and 3 Sigils are earned each day.
On the Faction Event Overview screen, you can see:
The current Faction Troop
Your progress in the Event
The current Faction Assault points you've earnt so far
How many Sigils you have

Faction Assaults versus normal Delves
Your progress in the Faction Event will carry over to the Faction in the Underworld, and your progress will remain there even after the Event ends. This includes:
Your Delve Difficulty Level - If your Faction Event Delve Level is higher than your Delve Level before the Event started
Your Faction Renown - All your best Delve records will be included in the Faction outside of the event and can be viewed in the Faction Info permanently.
As Sigils in the Faction Event allow you to play through an entire Delve, the Valraven appearance rate is lower than in other Event types.
Fight battles
On the Fight tab, you will see a normal Delve Map. In addition to the usual Delve screen, you will also see your Faction Assault Sigils remaining and your current Event Score on the left. Battles in Faction Assaults start at Difficulty Level 20. Each Boss battle won in a Delve increases the Difficulty Level by 10.
You cannot select your Delve Difficulty Level in the Faction Event. You cannot lower your Delve Difficulty in the Faction Assault.
In the Faction Event, your Room Treasure Multiplier will always start at x2.
Other than these differences, the Delve itself is played the same way as a normal Delve.

Earn Rewards
In addition to claiming Delve Rewards as you finish each Event Delve, you'll also earn points as you complete Rooms in the Delve. For normal Delve Rooms, you'll receive 100 Points x the Room Treasure Multiplier. For Boss Rooms, you'll receive 200 Points x the Room Treasure Multiplier.
Once you receive enough Points, you'll be able to collect more Rewards in the Rewards Tab.
Rewards in Faction Assaults can include Chaos Shards, Ingots, and Orbs.

Menu Overview
Faction Assault Shop
In the Faction Assault Shop, you can use Gems to purchase special Faction Assault Packs. Items they can contain include:
Gold
Sigils
Faction Troops
Chaos Shards
Weapons
For each Faction's Assault, the same Weapon is available in the Shop
Treasure Troops to upgrade your Treasure Hoards
Ingots to Level-up your Weapons
Each Shop Tier must be purchased in order; however, Stage VII (7) of the Faction Assault Shop can be purchased as many times as you want.

Leaderboard
The Leaderboard shows the 100 players globally for your Platform who have the highest Faction Assault Delve level and who have earnt the most Points during the current Faction Event. The players in the Top 100 will earn extra rewards when the Event is over. You can also see how you compare with the rest of the community here.
Tips
Sigils will accumulate day to day during the Event. However, they will not carry over into the next Event, so ensure you use them before the end of the Event.
Be careful! If you raise your Delve level too high, you may not be able to win battles with your Faction Troop team. Try using your Faction Troop team at regular intervals so that if you get to too high a Delve level to win the Delve with the team, at least you've earnt some renown with the team beforehand.
The Delve Difficulty in the Faction Assault will reset to level 20 each time a new Faction Assault starts. ie. If you play an All-Seeing-Eye Faction Assault and get to Delve Difficulty level 100, the next time there is an All-Seeing-Eye Faction Assault, it will start at level 20 again.