Posted byon August 6, 2019.
Last updated byon August 9, 2020.
Go to the pumpkin patch (460,405) down the road Illumination Way. The patch is just south of the entryway to Innsmouth Academy. A break in the fence serves as an easy way in (500,415).
Defeat all of the Ghostlights wandering the pumpkin patch. There are 7 in total. All of them must be killed to proceed.
Destroy Jack O'Lantern, who saunters about the pumpkin patch once all Ghostlights have been dealt with. He has the buff Pumpkin Fort, and as such is immune to knockback, root, stun, and weakening effects.
If you do not engage and defeat Jack in time, he will eventually hop back into the ground and you will have to defeat the Ghostlights all over again.
Follow the wisp of Jack to its destination: the field full of scarecrows south of the pumpkin patch (475,360).
Defeat all 5 Sackcloth scarecrows, be they Sackcloth Poachers or Sackcloth Haunts. The Sackcloth Scarecrows are all Built to Last and have a greatly increased resistance to impairment effects.
When all of the Sackcloth Scarecrows have been cleared from the field, Jack O'Lantern will appear (465,320). If left to his own devices and not engaged for a period of time, he will go back into the ground and require more Sackcloth Scarecrows cleared to bring him back up.
Follow the wisp once more as he tries to make his escape. The wisp leads to a field full of ravens and ghostlights nearby (455,300).
Kill three Revenants. There are multiple conspiracies of ravens in the area that form Revenants. Approach any unkindness in order to engage a Revenant.
As soon as three Revenants have been killed, Jack O'Lantern bursts forth (475,275) and charges toward you with a Ghostlight at his side! Defeat him.
Follow the wisp across the road to another pumpkin patch (525,265). This one is by an abandoned trailer.
Go through the pumpkin patch. There are various malformed pumpkins in the ground that resemble Jack. When approached, they will be Jack O'Lantern wisps or Jack O'Lantern himself. Jack could be any one of these ghastly gourds.