Acid dragon low spellbook levels if anybody struggles with 6th stage
Full video here, I've heard some voices people still on 70+ levels are struggling, here you have example how you can pass even alone with 2 other low lvls 
Or just as premade party of 40+ lvl people, just then everybody pick +15% boost after warewolfes, and two of you should use Bellatrix with Crucio, Priori, Atmospheric Charm, Cassandra and Hermione, and instead of auto-attack boosts, pick bonus for companions/summons
https://www.youtube.com/watch?v=09o_HEHbKyo
Or just as premade party of 40+ lvl people, just then everybody pick +15% boost after warewolfes, and two of you should use Bellatrix with Crucio, Priori, Atmospheric Charm, Cassandra and Hermione, and instead of auto-attack boosts, pick bonus for companions/summons
https://www.youtube.com/watch?v=09o_HEHbKyo
