How to make a passive spell that's effect is like that:
Level 1: If a unit attacks you, there is 10% that he will be cursed with entangling roots.
Level 2: If a unit attacks you, there is 15% that he will be cursed with entangling roots.
Level 3: If a unit attacks you, there is 20% that he will be cursed with entangling roots.
Level 1: If a unit attacks you, there is 10% that he will be cursed with entangling roots.
Level 2: If a unit attacks you, there is 15% that he will be cursed with entangling roots.
Level 3: If a unit attacks you, there is 20% that he will be cursed with entangling roots.