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You start out in the water as Deep Blue.  Advance and destroy the submarine and kill any Diver Trolls that are lingering around.  Enter the now open tunnel and look out for the lone Diver Troll that guards the entrance.

Advance through the tunnel and kill the two Diver Trolls hiding among the undergrowth in the first turn.  There is one more at the second turn as well.  At the top, the first thing you will notice is that Water Crabs are no longer hanging from the ceiling in a cage.  Instead, they are roaming around freely on the ground.  Fortunately, they do not run towards you on sight as in Normal Mode.  If you’re low on health, this is the time to replenish it.  Switch to Pummel Weed and walk directly in to them.  Now move to the center of the room.

An Elemental Fire Troll will appear and summon three Fire Trolls.  Eliminate them with Deep Blue.  For round two, he will summon several more Fire Trolls and three Archer Trolls.  Destroy them all after which he will become a maniac and try to do the job himself since others can’t do it.  He launches multiple Boom Root plants in your direction before charging you.  Evade them and cool him off with Deep Blue.  When he’s stunned you must act quickly.  Rubble does not work here therefore use Major Ruin.  When he’s been eliminated, spray the paddlewheel to raise the center structure outside. 

Now you must kill all trolls that appear before the trap door opens to let you out.  You will notice a different enemy here – two Water Trolls.  Exit the building when you’ve dispensed of them.

Now that you’re back outside you will have to you get to the top.  As you make your way up you will notice a lone Airship lingering around.  Destroy it with Thermite when you are completely at the top after which the door opens and seven Roll Trolls will appear.  Get rid of them and/or jump through the hole to enter the Water Temple .

You path to the room will be laden with many Shield Trolls and several Archer Trolls.  Show them the error of their ways with Thermite and Chilla then enter the room.

You are greeted by three Elemental Fire Trolls who will summon several Water Trolls.  When you’ve eliminated them, Fire Trolls will be summoned for round two.  Dispose of them and prepare for an onslaught.

Multiple Boom Root plants will be thrown at you.  Avoid them as best as you can and eliminate those Elemental Fire Trolls.  Walk around the room as Ash and toast those Plant Trolls.  Now spray the paddlewheel to raise the center structure outside even more.

As you depart the room and head down the hallway, Trolls and Water Crabs will jump out of the boxes.  If you’re in need of health, morph to Pummel Weed and allow the Water Crabs to heal you.

Once you’ve made it out, you will be greeted by three submarines and one boat.  The submarine will release Diver Trolls while combining torpedo attacks.  The lone boat at the surface drops cannon balls along with depth charges.  This multi-pronged attack is very dangerous and requires a lot of patience.  A lack of it will bring a slow death here or a quick one in the next area.  Your best plan of attack is to diversify your attention between the subs, boats, and Diver Trolls.

When you’ve disposed of the subs and boat, a trap door in the center structure will open and three Diver Trolls will emerge.  Kill them and proceed through the trap door where you will be greeted by a few more Diver Trolls.

Kill them and rummage around for health and be cognizant of the cannon balls falling in the water.  As you make your way up the ramp look out for those aggressive Cannon Trolls.  Don’t waste much time or you will get hit.  Your best bet here is to move up the ramp quickly with Major Ruin and knock them over.  At the entrance before the platform, you will find one more, less dangerous.  You can use Thermite on him.

Once on the platform, you will quickly notice the water fountain and four Shield Trolls.   Additionally, a Water Troll spawn will occur as the fountain being the source.  Focus on the Shield Trolls because more that likely you’re low on health and can’t afford to be hit a lot.  You need to kill just one to create a gap to get by them.  Once you’ve gotten by them, head left and into the room where Corallis is and you health will be replenished.

Defeat Corallis you will get the famous...