How to kill: craft some spikes (any kind), and cautiously place it in front of the therinzo’s path. When it touches it, it will try to attack the spike wall. Then while it’s busy attacking the spike, take out a ranged weapon that does a lot of damage and kill it. Did it and it worked.
I got DESTROYED by a mate boosted level 125 while wearing Ascendant & Mastercraft Flak Armor (1500 Total Armor). Avoid these on foot at all costs. If your character doesn't have high movement speed, you probably won't survive. The Ark Freddy Krueger