Board Thread:Help!/@comment-24398558-20140111232819

I just wrote a topic but it seems like it got glitched, and it just didn't appear ._. Anywayz, I've been playing the original Terraria for about an year and a half now, and I have pretty decent speedruns (3h15min to get from new hero to excalibur in v1.2) but there seems to be an element I don't understand in this mod. I have a melee character, a titan to be exact, and pretty decent gear [frost set from golem, ice sickle as weapon and pretty good accessories, including wings]. I decided to take on Destroyer, since he is the easiest of the mechanical bosses, and I started killing him. 300k HP, not a problem I thought. The problem is, as it's said, Titan is supposed to be the tanky class. I have 2160 HP and each laser from the boss hits between 450 and 500... WHAT?!?! No, seriously, once I get him down to 100k HP he just shreds me to pieces with lasers. There is NO WAY you can avoid them, even if you  are the proest at dodging stuff... How can I reduce the damage? I have frost set, probably best tanky set before killing a hardmode boss, and since custom items do not work, I have no idea what to do now... Any help is appreciated...

Additional info : Yes, I had a bunch of potions, a fireplace, max HP crystals, and about 30-35 VIT points. There is absolutely no way to even think about tanking this guy. I don't even wanna think what the twins can do... 