EARTHLOCK

The Hollow Knight is an optional boss found in the Shrine, just north of Druha Tower. Unlike the original version of the game where it was just sitting on the world map and always available to fight, you will now need to find four scepters to summon this boss. These can be found in the following locations:

• Earth: This needs to be crafted. You will find the recipe in a chest in Zabirum Temple. The unique item for it is behind the Amri Tree in Ramoo Villa (where you fight the pirate boss).
• Fire: Dig up in a Treasure Zone in the Desert Overworld.
• Air: Loot from a Scrap pile in the Plains Overworld.
• Water: Dropped by the Nahraan boss (story related).

Once you have all four scepters, go to the Shrine and place them in the four slots to summon and fight the boss. The main attacks used by this boss are all AOE elemental attacks that will hit the entire party for 2-3k each. Considering your health at Level 20 is only between 4-5k, this is not a good thing. The best way I found to tackle this boss was using Olia's super version of the Intervene skill. This will have her absorb all the damage the entire party receives onto herself. So while this will kill her in one shot, it will leave the other three at full health. Use your next move to bring her back (either use a consumable or Gnart's spell if his turn was next), and because her paired partner is still alive she will go right back into her Super stance (don't pair her with Gnart, you need his super as well in the next step). Use her Intervene skill again.

While she is sacrificing herself for the party, you should be laying out as many DOTs as possible (damage over time skills). Stack up a bunch of Fire Traps with Ive and use Amon's ranged ++ attacks to set them off (he's immune to bleed so don't use Gouge). Gnart should use his super after the third AOE attack (Olia will only be able to absorb two of them), and heal the party back to full health. His Heal uses three of the five super pips, so you could either use the other two for a Regen, or if he is paired with Ive you can use two of her super traps (I did this when I killed him).

The only other thing you can do to prepare for this fight is maybe switch out as many nodes in the Talent Boards as you can to include the Resilience card, which boosts magic defense, and craft extra Perks for extra elemental resistances, as well as Double Turn and And Back Again for everyone. This will lower his AOE damage and allow you to survive a bit longer, revive you upon death, and give you two turns if he misses with his melee attack. You should also be using any of the +3000HP health items you have during this fight, and enter the fight with both pairs of characters at full health and Super meter.