The "Deadly Secret" is one of those bad planetary abilities from SINS PLUS, kind of puts a risk into exploring. Once you get it, your done with that planet, and there is nothing you can do about it.
Th Black hole I'll get to in a minute.
Glad we are on the same page. Your right about Deadly Secret.
Yes, that's cool how they work our when designing maps. I'll look into those icons in the future.
Now about the dreaded Black Hole.
For now, it will not be at the center of the system (for now...)
It will be a non-colonizable planetary entity that will be like a wormhole or plasma storm, but far more deadly.
As you enter the gravity well of the Black Hole, your ship will start to take minimal damage. If you travel around the Black Hole, around the edge of the gravity well, you will be fine, and just warp away with a little damamge. God help you if you decide to steer the ship towards the center. As soon as the ship crosses into the accretion disk, the gravity will grab hold of the ship, slowly pulling it in towards the black singularity. Here, the gravity will continue to increase, making escape harder than before. As your ship gets even closer, damage will soon dramatically increase as the ship is crushed by the shearing forces of the increased gravity. If the ship makes it, the Black Hole will actually pull the ship into the sigularity, the heart of the Black Hole, in which the ship will be crushed beyond the size of an atom, never to escape (and of course will explode).
So, it will behave JUST - LIKE - a black hole should.
Frigates will have a hard time, Cap ships will do better. Just don't get near the center. It will eat your ship, and your entire fleet, if you get too close.
Don't worry though, they won't be that common, unless you want them that way in the galaxy creation screens.
A LOT OF WORK has gone into the Black Hole, so hopefully you will all enjoy it, even it does eat your first KOL ship that wanders into it.