Encounter modifier reference

What is an encounter modifier?

These modifiers add rules to one encounter, separately from your adventure modifiers. Normal battles have no random encounter modifiers, elites have one, and boss modifier count follows the layer number. Enemy-specific passive traits are separate.

All encounter modifiers

Modifier	Effect
Pentomino Pool	Use pentominoes as the base pieces.
Letter Sequence	Mix A–Z letters into the base pieces.
Number Sequence	Mix 0–9 digits into the base pieces.
Index Overflow	Remove PREVIEW and convert every 2 PREVIEW slots into 1 PICK; at battle start and every 10 turns, limit PICK to its first slot for 1 turn.
Prefetch Overflow	PREVIEW -1; at battle start and every 20 turns, fog PREVIEW for 10 turns.
Transform Overflow	At battle start and every 15 turns, disable rotation for 2 turns.
Regeneration Core	Max Health +10%; restore 5 Health each turn.
Overflow Armor	Max Health +10%; halve the portion of each hit above 100 damage.
Single-Line Armor	Max Health +10%; halve final damage from single-line clears.
Pollution Flood	Pollution appears more often.
Polluted Obsidian	Pollution and obsidian appear more often.
Obsidian Deposit	Obsidian appears more often.
Glass Deposit	Glass appears more often.
Thorned Glass	Glass and cactus appear more often.
Inferno Core	Fire and lava appear more often.

Defenses and action restrictions

Enemy regeneration advances with placement turns. High-damage reduction only affects the portion above its threshold. Single-line reduction applies only to attacks that clear exactly one line; it does not make all direct damage count as single-line damage. See Damage calculation.

Periodic restrictions and their remaining durations also use turns. Reducing preview slots, restricting PICK, and disabling rotation affect different actions. See Restrictions.

Random modifiers are drawn by choosing an available group uniformly, then a member uniformly within that group. An encounter cannot repeat a group. Groups have equal chances; individual modifiers across different groups do not necessarily have equal chances.