I'm just about ready to take on The Elder but I'm updating my bases with anti-troll defenses first. Moats/terrain walls and making sure my structures aren't within the log wielding troll's area of effect. At this point I can take down a no-star troll with about 4-5 fire arrows if I'm not already detected. Event trolls apparently spawn with a 200 meter detection range so they'll likely know where you are immediately.
I'm kind of wondering how prepared the OP is.
Anyway, sailing is refreshing and good exercise. Stay hydrated.