Battle formation

What a nightmare!

Flavor text for the Final Froggit, Whimsalot, and Astigmatism formation

In Undertale, enemy encounters are randomly triggered while walking in most overworld areas. When an encounter begins, up to three enemies can appear on the battle screen. More, or different, formations may appear depending on how far the protagonist is along each location.

Each room in which encounters are possible pulls from a designated list of battle formations.^[1] This article lists all potential battle formations that can appear in each of the four main locations.

Ruins

The following battle formations are present in the Ruins:

Formation	Areas	Associated script
Scripted events
Dummy	Dummy room (map link)	^[2]
Froggit	Blueprint puzzle (map link)	^[3]
Vegetoid	One switch puzzle (map link 1, map link 2)	^[4]
Unscripted events
Whimsun	Leaf Pile Cracked tile room First rock puzzle	^[5]
Froggit	Leaf Pile Cracked tile room First rock puzzle	^[5]
Whimsun	Leaf puzzle	^[6]
Froggit
Moldsmal
Froggit Whimsun
Froggit Froggit
Froggit Whimsun	Second rock puzzle	^[7]
Moldsmal
Moldsmal Moldsmal Moldsmal
Froggit Froggit
Moldsmal Moldsmal
Vegetoid	Froggit hallway One switch puzzle Rotating switch puzzle (room 1)	^[8]^[9]^{[note 1]}
Moldsmal Migosp
Loox
Moldsmal Migosp	Rotating switch puzzle (rooms 2—4)	^[10]
Migosp Vegetoid
Loox
Vegetoid Vegetoid
Loox Loox
Loox Vegetoid Migosp

Hard Mode

The following battle formations replace the default ones during Hard Mode:

Formation	Areas	Associated script
Scripted events
Parsnik	One switch puzzle (x2)	^[4]
Unscripted events
Final Froggit	Leaf Pile Cracked tile room First rock puzzle	^[5]
Final Froggit Whimsalot
Final Froggit Astigmatism
Final Froggit Whimsalot	Leaf puzzle Second rock puzzle	^[6]^[7]
Final Froggit
Moldessa Moldessa
Parsnik
Moldessa Moldessa Moldessa
Moldessa Migospel	Froggit hallway One switch puzzle Rotating switch puzzle (room 1—4)	^[8]^[9]^[10]
Parsnik Migospel
Parsnik Parsnik
Final Froggit Migospel
Moldessa Moldessa Moldessa
Astigmatism Astigmatism

Snowdin

The following battle formations are present in Snowdin:^{[note 2]}

Formation	Areas	Associated script
Snowdrake	Box Road Papyrus's sentry station Ice field	^[11]
Chilldrake
Ice Cap
Ice Cap Jerry	Snow puzzle Long bridge	^[12]
Ice Cap Jerry Snowdrake
Ice Cap Jerry Chilldrake
Gyftrot	Southern offshoot	^[13]

Waterfall

The following battle formations are present in Waterfall:

Formation	Areas	Associated script
Scripted events
Aaron Woshua	Quiet Area (map link)	^[14]
Unscripted events
Aaron	Large bridge seed puzzle Wishing Room Winding path	^[15]
Woshua
Moldsmal Moldsmal
Woshua Aaron
Temmie	Twin waterfalls Mushroom maze Crystal maze	^[16]
Moldsmal Moldbygg
Woshua Aaron
Woshua Moldbygg

Hotland

The following battle formations are present in Hotland:

Formation	Areas	Associated script
Vulkin	Floor 1 conveyor belts Magma Chamber Floor 2 walkway Floor 3 northern shooting puzzle	^[17]
Tsunderplane
Pyrope
Tsunderplane Vulkin
Pyrope Pyrope

CORE

The following battle formations are present in the CORE, a sub-area of Hotland:

Formation	Areas	Associated script
Scripted events
Madjick	Doorway (map link)	^[18]
Knight Knight	Crossroads north (map link)	^[19]
Whimsalot Final Froggit	Warrior's path (map link 1, map link 2, map link 3)	^[20]
Knight Knight Madjick
Final Froggit Astigmatism Whimsalot
Unscripted events
Astigmatism	CORE Branch northwest CORE Branch northeast CORE Branch southeast CORE Branch central Long bridge	^[21]
Whimsalot Final Froggit
Whimsalot Astigmatism
Final Froggit Astigmatism
Knight Knight Madjick
Final Froggit Astigmatism Whimsalot
Knight Knight
Madjick

Outside of Undertale

The following battle formations are present outside of Undertale:

Formation	Location	Link
Mr. Sunshine Abberant	Dog Hole	undertale.com
Vitamoid Wintercoat	Dog Hole	N/A

Notes

↑ While Froggit hallway and rotating switch puzzle rooms reference obj_encounterer_ruins5, the one switch puzzle references obj_encounterer_ruins6, which pulls from the same group of enemies.
↑ If Snowdrake is killed, battle formations involving him are replaced with a functionally identical formation involving Chilldrake.

References

[10] While Froggit hallway and rotating switch puzzle rooms reference obj_encounterer_ruins5, the one switch puzzle references obj_encounterer_ruins6, which pulls from the same group of enemies.

[12] If Snowdrake is killed, battle formations involving him are replaced with a functionally identical formation involving Chilldrake.

[1] _Script_scr_battlegroup script

[2] _Object_obj_dummy1_Step_0 script

[3] _Object_obj_encountertrigger1_Collision_1576 script

[vegetoid-4] 1 2 gml_Object_obj_vegetoid_overworld_Alarm_1 script

[ruins1-5] 1 2 gml_Object_obj_encounter_ruins1_Step_0 script

[ruins2-6] 1 2 gml_Object_obj_encounter_ruins2_Step_0 script

[ruins3-7] 1 2 gml_Object_obj_encounterer_ruins3_Step_0 script

[ruins5-8] 1 2 gml_Object_obj_encounterer_ruins5_Step_0 script

[ruins6-9] 1 2 gml_Object_obj_encounterer_ruins6_Step_0 script

[ruins4-11] 1 2 gml_Object_obj_encounterer_ruins4_Step_0 script

[13] _Object_obj_encounterer_tundra1_Step_0 script

[14] _Object_obj_encounterer_jerry_Step_0 script

[15] _Object_obj_encoutnerer_gyftrot_Step_0 script

[16] _Object_obj_trigger_room_Collision_1576 script, lines 18–26

[17] _Object_obj_encounterer_water1_Step_0 script

[18] _Object_obj_encounterer_water2_Step_0 script

[19] _Object_obj_encount_fire1_Step_0 script

[20] _Object_obj_core_enemyevent_Step_0 script, line 64

[21] _Object_obj_core_enemyevent2_Step_0 script, line 20

[22] _Object_obj_warrior_event_Step_0 script, lines 39–44

[23] _Object_obj_encount_core1_Step_0 script

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[note 1]

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[note 2]

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