BOSS TIPS: MIDGAR ZOLOM LV: 26 HP: 4000 MP: 348
This boss has two deadly attacks: one is a tail swipe that knocks a team member off-screen and puts them out of commission for the rest of the battle. The other one is the Beta enemy skill, which inflicts around 1000-1200 points of damage (which spells instant defeat if your allies are weak, although you should try to pick up this skill if you have a Enemy Skill materia equipped). Along with his bite attack, this serpent can be a tough enemy if you try to fight him earlier in the game. It's easier if you try to defeat him after you have Cid's airplane, since you can use Limit Breaks and powerful summon and magic spells to kill it. Unfortunately, you get a measly amount of EXP, AP, and gil for beating the boss and what's worse, he reappears when you return to the World Map, so you're right back where you started.
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Note that if Midgar Zolom knocks one of your allies off-screen, the game won't end should the other members be killed; instead, you'll find yourself standing at the edge of the marsh.