You wanted to play Mielon's The Sift and Yazz's Dungeons: The Sequel together? Well now you can. The owner of Yazz's Dungeons said himself he won't be making compatible version with Melon's The Sift because he is working on his own dimension. Because of that there were some complications and Ancient City was not spawning properly and special blocks to activate the portal were missing. This small mod replaces the Yazz's portal frame in ancient city to correct one with 8 Sift notes, that are needed to enter The Sift. This mod is NOT officially supported by the actual mod owner's, you still need both mods for this to be working.

Mielon's The Sift - https://www.curseforge.com/minecraft/mc-mods/mielons-the-sift

Yazz's Dungeons: The Sequel - https://www.curseforge.com/minecraft/mc-mods/yazzs-dungeons-the-sequel