There the stronger and slower dino in water

Do the cave of the strong and immune at level 71.70 and 69

To unlock the mosa saddle with an arthro (strong cave first)

tame mosa with an ichthy they won't attack you.

(FOR MOBILE)

How to get mosa saddle the easiest way:

1) Get a fishing rod (ascendant) the best way to get it is by offering artifact of hunter to obelisk

2) find a huge sabertooth salmon

3) place chair and sit on it and use ancient amber as a bait to catch the salmon

4) there's a chance you can get a mosa saddle

CONGRATS! YOU GOT A MOSA SADDLE.