Frosstbyte

We fight Chrom exactly like firemaw and just LoS behind the wall for all the breath attacks. Your healing needs to be very good and your hunters need to stay on top of tranq'ing. He does a LOT of damage, especially if you get the DOT breaths, and I've seen tanks go from full to dead in under a second a few times, particularly after the 20% enrage.

That's by no means the only place to tank him, but it works for us. Time lapse is a little different, but basically have everyone except an OT and a few healers get hit by it. You'll see. He's not so bad.

Edit: Also, this fight is cleanse or die. If anyone gets all five brood afflictions, he turns into a drakonid minion of chromaggus and goes around killing people. Each one is a different type of debuff, so keep track and get them off people. We usually assign cleansers to groups to make sure no one gets missed in a free-for-all.