Easy method of grappling to the Orowyrm

Chasing the Orowyrm while flying on Kaithe is the standard way, but there is a way to ambush them.

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[Warframe Duviri] Little Known Way to grapple to the Orowyrm

The following landmarks are for 90 FoV, but you should be able to find landmarks easily in other settings because they are not strictly required.

1. After picking up the Orvius, open the map and teleport above Watershed Hamlet. (Riding Rank 4: Fast Travel is required.)

2. Go north and stand on the front grass (A) to the right of the bridge, and align the reticle with the back grass (B).

3. Use Smoke Screen at the moment when the tip of the Orowyrm reaches the highest part of the left tree (C).

4. Throw the Orvius while jumping after getting a little closer to the Orowyrm. (You can also fly up with Kaithe to get close to it. Especially on the Steel Path, it is faster to directly grapple to the rear ring with Kaithe.)