NOTE: Acrobat is preferred costume to take them down, however it is just a suggestion, mix it up and go in however you like

Lanced Negati's are the hardest versions of the enemies that block the door, usually near end of the level.

There are three versions, the normal version, red versions (hard mode) and Lanced versions which are bigger and have a bigger appearance to their normal versions.


They can only be spawned in hard-mode (red stamps at end of level). To get hard-mode (as far as it is known) is to defeat a lot of Negati's without losing your costume.
NOTE: You do not need to complete a level in hard-mode for them to spawn, you just need to be in hard-mode for them to trigger.

You know you are in hard-mode when small enemies spawn red.


Losing your costume even on a boss will stop hard-mode for you, however if this happens at all just force-quit the game from task manager/task menu before the game saves will result in it loading the save before you went into the level.

This is my preferred way to also spawn the Lanced enemies. Even if you are on hard-mode, the mini-bosses may spawn as just red variants. If this happens, force quit the game and reopen it, and repeat until the boss spawns as its Lanced version. This took me 2-4 reloads each time and saved me from having to defeat the chapter boss over and over in hopes a Lanced would spawn.


Ghosti
Easiest one to get out of the achievements due to he will randomly spawn in a mob of red enemies so just keep fighting those hordes, however please note that he goes invisible if you get too close to him so keep those eyes peeled!


Lanced Plenti - Spawns in world 5-1 (preferred) & 8-1


His attack window is very small, because of this it is best to spawn him in 5-1 because 8-1 even with the skater or even the Acrobat costume he is very hard to hit


Lanced Endlessli - World 1-2 & 6-2

Not much difference from his normal version except he will summon his attacks faster, Acrobat is a good choice to use. Best in 6-2 because his spawn spot is legit behind the starting area making it quicker to attempt him to spawn in


Lanced Multipli - World 2-2 & 4-2, either is preferred

This version spawns two of himself meaning 6 hits are needed to defeat him, Acrobat or Jellyfish costume are preferred.


Lanced Nessi - World 7-2 & 9-2

Has a barrier that protects him which you must wait for him to get rid of to attack him unless you use the Ghost costume, however you may still get hit by his large attack so best to wait it out and use Acrobat

Below contains a spoiler to a costume, read at your own risk.
This costume is NOT NEEDED to spawn the Lanced, however it does make it quicker to get to each blocked gate, saving you time everytime you reset trying to spawn the Lanced Negati.

Quickest way to check if the boss will spawn as a Lanced version is to use the Balan costume due to the jump height and flight speed, Balan pretty much breaks any level.

How to get the Balan costume: https://www.youtube.com/watch?v=qH3PRi90UrA

PLEASE NOTE: King Tim is random, after speaking with the video creator Balan's hat is not important for the King Tim. It appears to be random after making two Tim's with 3 badges each lay an egg. However video information is still useful for those seeking the costume

Will update once a 100% confirmation way of getting a King Tim has been found.

FAQ

You need to complete the tower for hard-mode to unlock?
NOPE! The tower has nothing to do with hard mode, this also goes for trophies, you do not need to 100% a level or the game to unlock hard-mode.

I killed a the red Negati blocking the door but didn't get the achievement
Red versions are not Lanced versions. They are just a little big harder than the normal black versions. Lanced versions are bigger and added designs (please check Lanced section for screenshots)

Do you need to complete the level for the achievement to pop?
Nope! Just defeat it then and there and it will pop. This is good if you lost a costume you want back as you can just force restart the game while keeping the achievement.

Wouldn't Moon Walker be easiest to take Plenti down?
Nope, Moon Walker actually has a glass break animation for mini-bosses and chapter bosses meaning his power does not work, making him useless.

Can you just exit the level and re-enter to change the spawn?
This is unknown, so far going back into a level after spawning the mini-boss has only had it spawn in as the one seen when the spawn cutscene triggered the first time as its spawn as already been set by the games coding.



Not too fond of how much random luck is needed for some parts of this game but I hope this guide helps. Actually surprised there was no boss rush for those who preferred to fight the Lanced versions.


I like to thank Tomas Rodriguez, SpiralKipz & Unbroken Odds on Youtube for helping solve each step to these enemies as well as helping to test levels and theories to confirm how to get the achievements.


https://psteamcommunity.yuanyoumao.com/app/1341050/discussions/0/3076495389984131344/
And thank you to this thread for bringing to light what the red stamps were to begin with and how to actually trigger them.