Use weapons and wear armor. Here is my 3 step system to defeating those: 1. Spot the enemy 2. Start going in for a sword kill 3. Realize I am going to die and run back to the safe town.
Stay away from Momentous. Shoot him with an infinity bow. If you can, get him in water. He has a slowness effect, so he barely moves in water. When fighting Marlix, get about 15 blocks away and block yourself in. Drop a bucket of water in a hole. Pound her with a bow and kill the minions with a smite sword. An infinity bow with unbreaking 3 is almost necessary. It takes about 5 stacks of arrows to kill either.
Most of what you said is correct, however when you use a bow, you are always looking at him, so you will be drawn in...
Just saying...you don't HAVE to kill momentus with a now. I've killed probably half a dozen, solo with a sword.
better question would be... how do you FIND a momentus or marlix because i've been wandering around the wild for days trying to find one and so far havent
Ayeee Basically it's just weird spawn rates sometimes...our outpost had 4 momentus's and 3 marlix's spawn within two days.
be on a less populated server, be in wastelands (they spawn more commonly there ive found), be in grasslands/desert, move alot in said biome jumping seems to help (i think because it resets the block you land on)