Instead of two robbers:
For Cities and knights, this is my idea:
(Remember you already have the pirate from seafarers if you play with that).
The Black Knight (new piece)
The black knight works the same way as an unfriendly knight:
→ It can break a road and block building of roads and settlements.
→ It can be displaced by normal rules for displacing knights.
→ It can be displaced even by basic knights.
→ It moves independent of roads.
→ It can only be placed on land.
→ It must be placed on the end of a road (or shippingline).
When moving the black knight you can steal 1 card from the owner of a connected road or ship (as with the robber).
When using all three black pieces you must move two of them when rolling a seven, and no player can be blocked with more than two of them.
Questions or comments?
I'm playing with the normal expansion 5-6 players not the cities & seafarers expansions.
Some of those ideas sound nice, how can i make them work with my game?