There's a number behind every world worth living in. Ice Link Valley is seeded with 1073017621783158765 — locked in when the server first started, so the land is what it is and stays that way even if the map is ever regenerated.
The surface is plain survival; underneath, a set of datapacks gives it character.
Seasons fold into all of it, rolling through the year as the world turns.
A couple of practical notes: