Unification with the name in the book title with the name of the protagonist in the book --> Boing vs. Bumpo!
Missing articles. It should be read: "[...] von der Vettel [...]" and "[...] wie die Vettel [...]".
When defending the Druid Grove, you cannot enter its inner area where the Druids are entrenched. But if you enter the inner area via the secret path in the Underground Passage, then a) Rath, Silver and Arron are hostile and b) all other druids are completely missing. Here a) all druids should have been present and b) not necessarily immediately hostile, but maybe just surprised... This approach seems unfinished...