Overview

• Generally vanilla feel
  
• The world "makes more sense" on the larger scale (for example, continents are separated by oceans)
• Numerous tweaks to terrain shapes
• Biomes larger than in vanilla (but smaller than "large biomes")
• Mild impact on performance
• Stable and reliable
• Likely to stay compatible with future Minceraft versions (no guarantees though!)

This might be for you if...

• if you like to connect your builds with road networks and bridges
• if you like to use the natural terrain and work with it, instead of seeing it as an obstacle to be terraformed away
  
• if you care about the "strategic importance" of castles guarding important passes, bridges spanning narrow straits, port cities nestled in natural harbors, rich towns along important trade routes, etc.
  
• if you care how your builds are interconnected
• if you like to... worldbuild

Features: Continents

• Dry land forms continents separated by oceans
• Landmasses of any size: tiny islands,, large islands, small continents, large continents, the biggest ones streching on for tens of thousands of blocks
• Detailed and varied coastlines
• Islands are often in places that makes sense, like next to a continent just off-shore, or as part of an archipelago
• Continents are often separated by a narrow strait, or connected by a narrow isthmus

Features: Rivers and Valleys

• Branching river systems
• Rivers are more likely to actually lead somewhere instead of just going in circles
• Rivers are less likely to end abruptly: they can cut through mountains, forming narrow gorges
• Rivers aren't all over the place, not all valleys have a river in them
• Rivers are less likely to be messed up by big cave entrances
• Rivers can have islands in them

Features: Mountains and Ridges

• Generally more hilly terrain, but large flat regions do exist
• Mountains often form long, narrow chains
• More varied hill and mountain shapes
• Larger regions of "windswept" terrain

Features: Biomes

• Mostly the same as in vanilla
• Biomes are somewhat larger than vanilla
• Biomes of different climates tend to be further apart (as a side effect, you may need to explore quite a bit to find a hot or frozen biome)
• "Positive weirdness" biome variants are less common (ice spikes, for example). In vanilla, positive weirdness covers 50% of the world, in Eldor it's only 33%.
• Mushroom islands are actually islands, and have these strange alien shapes. (This was a bug, but I promoted it to a feature.)

Stability and Performance

• Chunks generate slower than in vanilla, but you probably won't notice much of an impact during normal survival play
• If you want to elytra-fly into new chunks though, you may need a strong PC
• Extensively tested. I encountered no crashes or glitches in 100+ hours of exploration.
• Quirky terrain generation does happen sometimes, but nothing beyond what we all expect from Minecraft

Compatibility

• Changes as few vanilla files as possible, so it should be technically compatible with most other world generation datapacks
• "Technically compatible" doesn't necessarily mean "practically compatible". You may get strange results.
  
• Generally, datapacks that improve biomes or add new ones should work perfectly fine with Eldor
• I tried to make it as safe as possible for long-term worlds. I expect it to stay compatible with future versions of Minecraft. (No promises. Ultimately, I don't know.)

About the Screenshots

• The screenshots are all from seed 1. This is a perfectly average seed.
• The map is an Unmined render of seed 1 from (-10k; -10k) to (10k; 10k)
• Note that the continent in the center is only medium-sized

Notes for Datapack Creators

• The overwritten vanilla files are: (1) the vegetation and temperature noise files (2) continents, erosion and ridges density function files (3) the caves/entrances density function file
• You're allowed to use parts of Eldor in your own datapack