A P E X
For the most part, invasions on the board have become both a close and long-range affair. Factions, despite not sharing a border, can reach out and touch each other with fire and death from across the map. However, one hex is immune to this style of invading: Capitals.
I'd like to suggest an amendment to the Capital Hex immunity that would be dependant upon a faction's borders. In brief, if your capital is exposed/on the edge of your space, it can be invaded. If it is not, then it will enjoy the typical immunity.
This would have the affect of incentivizing the "shoring up" of ones borders - and would give warmongers a chance to actually defeat an enemy faction in full via Invasions.
What do you think Chaos?
I'd like to suggest an amendment to the Capital Hex immunity that would be dependant upon a faction's borders. In brief, if your capital is exposed/on the edge of your space, it can be invaded. If it is not, then it will enjoy the typical immunity.

This would have the affect of incentivizing the "shoring up" of ones borders - and would give warmongers a chance to actually defeat an enemy faction in full via Invasions.
What do you think Chaos?