LegionCraft is a OneBlock server where you build up your island and keep expanding your world.
The big thing here is challenging bosses. When you beat them they can drop keys that you use for rare loot.
There are crates with epic gear and rewards so you always have something to grind for. You can also use chunk hoppers to automate your island.
It is also listed as no pay to win so it is meant to feel fair while you build grind fight and loot.
OneBlock Boss Hunts on LegionCraft
GG.MINEWIND.NET New Server IPOneBlock Boss Fights on LegionCraft
I found LegionCraft and it is a OneBlock survival server where everything is about building up from a single block and pushing your island forward.
There are challenging bosses and when you beat them they can drop keys for rare loot. You can use keys on crates to get gear and rewards.
It also has chunk hoppers so you can automate parts of your island. The server says it is not pay to win so it feels more fair while you build grind fight and loot.GG.MINEWIND.NET New Server IP