D.A. includes;

• QoL changes such as journey map, inventory improvements, flat bedrock, & more 
• World Generation improved across the overworld, nether and end. More biomes and bigger & better structures 
• New Mobs both peaceful and hostile, with a scaling difficulty
• Farming and Cooking additions for new crops, recipes, and better hunger visualization 
• Alchemy & Magic Tools/Accessories to make the best use of the materials around you ;)