Semi-randomized, procedural and customizable mission with optional plot to follow. Your task is to find and take home the body of your brother who was killed recently on Altis - island terrorised by local warlords, brutal bands of mercenaries and other marauders of just burned out civil war.
A sandbox that gives you a freedom you may experience in the ArmA3 campaign, Act 2. But this mod is better, because you can choose a random starting point and navigate by the stars until you find a map. If you need to, you can choose a buddy.
The only downside is the repetitiveness, because you have to explore about 30-50 churches. This gives you a goal, but the path to it is too predictable. Although, random will try to make it more unpredictable.