How to become an Investor in the game?
Everyone becomes an investor (including players with NFT) who has done at least one of the following actions:
Increase the Faction's attack for TOWER ("Buy Attack" button):
Revive a dead NFT character (your own or someone else's), click on the button with the image of a first aid kit:
Boost up your character's level up progress:
You can learn more about the mechanics and rewards in the article "Investors":