I had an idea for an attacking mechanic.

Please tell me your thoughts.

Attack Requirements:

Attacker must own a settlement or city directly connected to the target settlement or city via the attacker's own road. Attacker must play one Knight card.

Attack Restrictions:

In the round of the attack, the attacker may neither trade nor build.

Defense:

Defender can completely block the attack by playing two Knight cards.

Success Condition:

If undefended, attacker rolls two dice. The attack succeeds if the sum matches a number on a field adjacent to the target settlement or city.

Consequences of Success:

- City: downgraded to settlement (loses 1 victory point)

- Settlement: completely removed from the board; only directly adjacent roads of the same color are also removed

- Freed spaces can be built upon normally starting from the next turn

Protection:

A player can protect their own settlement from attacks by building roads of their color at all three adjacent nodes, making it geometrically impossible for opponents to establish settlements nearby and thus making an attack impossible.