PHASE 5
The system experiences a gentler age, but one in which great movements occur. The cold outer reaches of the system are disturbed, casting a shower of icy particles all the way to the innermost planets.
Hunter3K falls inwards again as it gobbles up some of the debris that has accumulated within 1AU. Its surface is regularly disturbed by heavy impacts. The thin crust already has a system of plate tectonics going on, above a churning and highly magnetic core of molten metal. Tenuous seas appear at the poles, but water rarely accumulates elsewhere on the hot, dusty surface.
Spryverri moves slightly outwards towards Citizen1. The crust cools off, but the large planet remains warm, trapped in a steamy greenhouse atmosphere. Surface water exists only at the poles, if at all. There is a weak and sluggish motion of continental plates. The core of the planet remains very hot, slowly venting through hundreds of super-volcanoes.
Citizen1 now experiences the opposite, a global ice age. There is plenty of water on the surface, but it is mostly frozen. The core of the smaller planet is rapidly cooling, but for now, volcanic activity keeps open some seas near the equator, and here there are already signs of microbial life. Citizen1's orbit is disturbed by the approach of Mergatayren, but it is able to find a new stable spot between its neighbours.
Mergatayren enters an unstable resonance with Cull and Kalotherco, eventually shifting over 1AU inwards before reaching equilibrium with the inner planets, for now. The change is enough to widen the layer of warm, moist gasses in Mergatayren's atmosphere. The core now consists largely of pressure-crystallised ice.
The change makes little difference to Mergatayren's moons. TBG develops a dark sea of geothermally-heated water beneath an icy crust, while Badunoff grows larger as a result of several fluke collisions with migrating planetoids.
The anomalous object Ig arrives in an eccentric orbit centred at about 4AU.
The giant Kalotherco settles into a new orbit at 6AU, completely swapping places with Cull and starting a chain of planet migrations. At this distance, Kalotherco's moons remain frozen over. But North's core in particular is heated by tidal forces, and an abundance of organic compounds has helped microbial life gain a foothold here.
Bestage is pulled inwards as it swaps places with Cull, unfortunately losing the chance to gobble up the last gas in the outer system, while gaining a dangerous and eccentric orbit between its too larger neighbours.
Cull is able to make a final growth spurt on its way outwards, but finishes well below Kalotherco in terms of mass.
As for Cull's moons, it seems that the orbit of Luckymoose is deteriorating. Its atmosphere thickens, but at such a distance from the sun, the surface now grows even colder. Microbes continue to survive in geothermal systems. The same is not yet true of nearby Omega, though pockets of liquid water now exist there beneath the frozen surface.
Lightfang is pushed right out to the edge of the system, growing to roughly the size of Bestage before the remaining gas and debris is finally scattered. It does however pick up a whole retinue of icy moonlets.
*NOTE: 'ACCRETION' ACTION NO LONGER POSSIBLE*
Perhaps one more turn for migration and/or terraforming efforts?
yay! 
