Enderal is compatible with many Skyrim mods, but v2.0.20 changes several FormIDs (internal IDs). If you used a mod list before, you must update it.
“…v2.0.20 makes sure you cannot skip the final conversation with Tealor Arantheal. You have to hear him beg. You have to feel it. No dialogue skip. No console command. They want the pain to compile properly.” Enderal Forgotten Stories v2.0.20