Tamed a 145 and was super easy.

1. Lure dino to flat land and it will pretty much stay in the exact same spot the whole time.

2. Put down a dino gate with door so u can hide from breath. The gate should be perpendicular to the dino and off to the side a bit so the line of sight from u to dino should be clear.

3. Step out and the dino will shoot ice balls at u and during this time keep your shield up. Should shoot 2-5 balls before breath attacks.

4. It Always does 2 breath attacks in a row. During this time just hide behind the gate.

5. After second breath just rinse and repeat.

I used no brews but they are good to have. Prim flak is fine.

Each ball did roughly 300 torpor damage and the 145 had 38k max torpor. I had a bat out and it just stayed behind the gate the whole time.

Very easy tame if done this way. Only twice did it seem to deagro but was only for a few seconds and it didn't move at all.