Step 1. When in falanaar tunnels find thin stairs (the same as the ones right next to leystalker Dro's door)
Step 2. stand in the middle of the stairs and wait for leystalker to spawn ontop of you
Step 3. watch as leystalker dro cannot dash due to pathing problems.
Step 4. ????
Step 5. Profit
Ps. you cannot kite him to the stairs, his dash will still work for reasons unknown, also as Sensisativa said he doesnt always spawn by the stairs but i believe he is stealthed and patrols.