Dragon Quest VI: Realms of Revelation/VS. Mortamor

Note: Because this Boss Fight is one of the hardest in the game, a link has been provided to demonstrate the instructions of this page:

This fight is so long, Mortamor's attack patterns are so complicated, and his attacks are so wildly different between phases, that it's hard to really give a good strategy without going through it turn-by-turn. This is why the two videos have been provided. Use those as your primary "walkthrough". Use the notes here only to remind yourself of the highlights.

VS. Mortamor (Round 1)
CLIFF NOTES:
 * 1) Use Sage's Stone at every opportunity, even if your party is at full health
 * 2) Have Terry equip the Hela's Armour if the party is at, or close to, full health.  It will drop his Agility to 0, and guarantee he goes after Mortamor.
 * 3) Have Terry remove the Hela's Armour if the party is hurt.  The Meteorite Bracer will max out his Agility, and ensure he goes before Mortamor.
 * 4) Swap everyone out except one character out any time Mortamor ends his turn with "Bounce", "Disruptive Wave", or "Venom Mist".  Otherwise, you might eat two AoEs in a row.
 * 5) Use Antidotal Herbs or Squelch if you are envenomed.
 * 6) This form is practically immune to Knuckle Sandwich.  Don't use it.

VS. Mortamor (Round 2)

 * 1) Raise everyone's Defense as high as you can via Buff & Kabuff.
 * 2) Buff & Oomph signal that he's entered Pattern B.
 * 3) Mortamor will cast Buff & Oomph on himself, even when it's useless to do so.
 * 4) Beware if Mortamor ends a turn with Buff or Oomph.  It means a potential double AoE turn.
 * 5) On the flip side, be grateful if he ends a turn with Scorching Flames.  It means he can only attack you with Mercurial Thrust or Roundhouse Kick.
 * 6) If on the SNES version, Carver should stay away from Focus Strength + Hela's Hammer.  A bug makes it so Oomph + Focus Strength + Hela's Hammer will overflow; causing it to wrap around to single or double digit damage, instead of what it should be.
 * 7) Keep track of Mortamor's HP.  You don't want to be injured walking into Round 3.

VS. Mortamor (Round 3)

 * 1) Kaclang is the only way to make this fight 100% consistent, as it allows you to skip all of Pattern B, and everything nasty about Pattern A.  Otherwise, there will always be a small chance the fight goes off-script
 * 2) Swap everyone out except one character on the 2nd Turn in Pattern A!  Raging Roar always comes that turn!
 * 3) Carver should Focus Strength on the 3rd Turn in Pattern A, and Knuckle Sandwich the Left or Right Hands on the 4th Turn.
 * 4) Oomph should be established on Carver on the 3rd Turn, as well.  It ensures that Mortamor uses Disruptive Wave instead of Freezing Blizzard on the 4th turn.
 * 5) If Amos has it, he should cover Carver with Selflesness on the 4th Turn, so Disruptive Wave doesn't take Oomph off Carver.
 * 6) Ashlynn, if at the recommended job class & level, will do ~298 Damage via Magic Burst on the SNES version, and ~447 Damage on the remakes.  Plan Magic Burst out accordingly; you only get one shot at it.
 * 7) You should kill the Left Hand first, then the Right Hand, then Mortamor himself.  The hands have revival spells, while Mortamor does not.
 * 8) Remember the Kerplunk Bracer!  It fully heals & revives everyone in the party once the wearer dies!  Use it strategically!
 * 9) Healie should spam Omniheal on nearly every turn if he has it.  The beginning of this fight is by far the most dangerous.
 * 10) Be wary of Mortamor's own version of "Magic Burst" once the head is the only one left.  It's 200-220 Fire Damage to the party, though armour will reduce the damage.