Some musings about how to hunt the beast.
Don't follow Daisy around. Yeah, she always go after him, but she is slow. Hunters are a bit slower than the monster, and Daisy is even slower than the hunters (at least, hunters that use efficiently the jetpack), so if the group moves at her pace, you will never catch up. Daisy is more when you truly lost the monster, to have an idea of the direction where it is. Once you know that direction, run at maximum speed, leaving her again behind you.
The monster spawn in almost the same spot you (the hunters) spawn, just a few seconds before. So the first thing you have to do after landing is look around for footsteps or birds, then go FAST after him. No moment of doubt, just run, every second counts. And ignore the wildlife, I don't know why so many people like to lose time killing it in the first minutes. They get bored and like to shoot at things, I suppose.
With a bit of luck, your relentless pursuit will mean the monster won't have much time to feed and gain armor and evolve, mark it with Q every time you see him. 5.1 sound helps a lot of locate him, too. Follow him hard, and every time he stops to feed and recover some armor you should be somewhat near, pressing him again and making him leave the foot uneaten.
Fire at him, and usually the monster's player will panic and run away in a straightforward manner. Other players should use this to use a shortcut and trap him.
In fact, remember to use the map (tab) a lot, and try to predict where the monster is moving. Usually if you have a sighting here, then a bird warning there, and then a tree falling in the same direction, you can imagine clearly the path the monster is using, usually bordering the map in clockwise or counter-clock wise pattern. With that in mind it's easy to cut short and go to his next location.
If you have mics and some decent coordination try to divide in two groups, one following from behind and the other trying to trap him from a forward position.
When the monster evolves, don't be discouraged because of it, as in that moment he loses all his armor, it's the moment to press forward and try to catch him in a dome.
Obviously if he reaches level 3, it's time to camp the reactor in a coordinated effort. Even in level 3, a combination of mines and harpoons and bombardment (easy to him when he is trapped by a pair of harpoons) can destroy his armor fast. In fact when he is level 3 he is slower than before, try to juke his attacks. Double-jump to do a dash.
Sometimes if he is level 3 and he's killing one player after another, what the surviving player has to do it isn't to try to kill him or revive a downed mate almost dead (risking both deaths) but to run away, giving time for the other players to respawn again. But be careful with the reactor goal, as the monster can try that moment to destroy it.
A tactic is to fire at the monster from the distance if you are alone and he is starting to hit the reactor, it seems damage interrupts his destroying-reactor animation so he will have to go after you. Run away, use invisibility, etc, he may return back to the reactor, so repeat again the same tactic. With some luck your mates will be respawning around that time.
