If you pull the Mamools Wyrvren while his back is turned a 71 and up SAM can solo the wyrvern easy. Just use Seigan & Third Eye and use Meditate. Use Tachi: Kasha on it and it will paralzye the wyrvren badly. It dies fairly quickly but the re-pop time for the Wyrvren is kind long, round 30 min after a kill. Still it's great solo xp get round 230xp per kill and if you can manage to chain the two there you can get 331xp or so out of it.