Hello! I recently went and soloed Apollyon Limbus, and I noticed a few things:
1) There are Tauri DRK monsters that do not cast magic.
2) The Ahriman WHMs still cast BLM nukes.
3) The Ahriman SMNs don't call their avatars even during 2-hour.
4) The damage potential of Meikyo Shisui and Hellborn Yawp is high enough to wipe everyone in range before they can respond. You might want to consider making sure the demon boss is limited to only using it only once per 2-hour.