The Crystal Scar consists of 5 capture the flag points. The map is circular, with the 5 capture points positioned where the tips of a star would touch the edge of the circle. The bottom-right and bottom-left capture points are located very near to each of the two 5-man teams' respawn/starting base.
Starting out, teams capture the two capture points on their side, and also compete for first capture of the top-most point. They can split into two groups, 1 or 2 should go to the bottom-most point and defend that position, then the other 3-4 should rush to the top of the map and try to get the point there first. One player should grab the other point on the way.
From this point, it is a matter of working your way clockwise and counter-clockwise towards adjacent capture points from the ones you control. Focus on defense and push minions, kind of like normal tower protection in Summoner's Rift and Twisted Treeline.
The goal is to degrade the 500 hit points of the enemy's crystal, which will count down slowly if you have 3 capture points or more.
There are no neutral monsters, but minions spawn from your controlled capture points. Capture points have towers that will attack enemies, but will stop if the tower starts getting neutralized.
Also, there are power-up spaces for speed boosts and healing.
Many items are not sold that you are used to.
Mana regenerates quickly, xp and gold increment very quickly in this map.
I played 5 games, and was not greeted well by people who'd been playing for 2 days before I got a chance to try. Somehow they already expect you to know what's going on. The 3rd game, I joined friends, and it went great, but we got matched with harder opponents and lost the 5th game. It's a fast-paced, hyper-charged version of the game where you can hit max level 18 in 10-15 minutes. Just be sure to go to bed at night.