1.9 threads are one of the most popular ways to invest in Great Buildings in Forge of Empires. With them, you can maximize your investment rewards and grow your Great Buildings faster, with fewer Forge Points (FP) needed. In this guide, I’ll explain how this system works in detail.

How do 1.9 Threads Work?

In a 1.9 thread, players invest in other players’ Great Buildings using the 1.9 multiplier. This means that if a position requires, for example, 100 FP, the investor contributes 190 FP (100 FP x 1.9). In return, they receive a reward from the Great Building, and the owner levels up their building more quickly.

The process looks like this:

1. The owner of the Great Building publishes information about the building in a dedicated thread and informs which positions are available (e.g., 12345).
2. Players choose the positions they want to invest in and enter them in the thread (e.g., 1).
3. Each investor contributes the amount of FP multiplied by 1.9, which guarantees them rewards.

Why the 1.9 Multiplier?

1.9 is the optimal investment multiplier for players who have Arks at level 80. Why level 80? At this level, the Ark provides a 90% return on investment, meaning that investing 1000 Forge Points (FP) gives you 1900 FP.

Higher Ark levels offer diminishing returns, making it less profitable to level up the Ark beyond 80. For example, at level 90, the Ark provides only 91% - 0.1% per level, while earlier levels offer 0.5%, 1%, 2%, or even 3% per level.

How to Calculate FP to Contribute?

To calculate how many FP you need to invest, take the number of Forge Points required for the slot and multiply it by 1.9. For example, if a slot requires 100 FP, you must invest 190 FP (100 FP x 1.9).

Benefits of Using 1.9 Threads

1.9 threads offer several benefits:

• Fast leveling of Great Buildings: By investing in Great Buildings with a 1.9 multiplier, you can quickly level up your Great Buildings without needing large amounts of your own FP.
• Guaranteed reward returns: Investors can secure guaranteed rewards (FP, medals, blueprints) from investment slots, making the system safe and predictable.
• FP storage: If you have a full FP bar, 1.9 threads allow you to store Forge Points, saving them for later use.