Movement

This article details how movement works under the hood in Underrail.

Basics

At its core, Underrail's game engine is real-time with smooth movement. This is converted into discrete square map tiles and combat turns for gameplay purposes.

• One turn equals 5 seconds
• Moving the distance of one tile costs 10 MP
• The unmodified movement speed equals 135 MP

Distances are calculated as two-dimensional Euclidean distances (also known as Pythagorean distances) and movement point costs are rounded up to integer.

Example: Moving one tile diagonally costs 15 MP, moving 10 tiles diagonally costs 142 MP. (Rounded up from 14.1421356237 and 141.421356237 respectively.)

Items and effects that modify movement speed or movement points usually modify both. These values are not automatically converted, they're manually defined on each source of movement modifiers, so they're not necessarily completely consistent.

Real-time

All movement speed modifiers stack additively, except Stealth Mode penalty, which is multiplicative with the others.

Agility, MP/AP, Armor Penalty, etc. have no effect on movement speed.

Movement speed modifiers
Type	Source	Modifier	Notes
Items
	Infused Cave Hopper Leather armors	Increases movement speed	Depends on quality
	Tabi Boots	Increases movement speed	Depends on quality
	Strider Boots	Increases movement speed	Depends on quality, decreases stealth skill
	Jumping Stilts	Increases movement speed by 40%
	Rathound Regalia	Increases movement speed by 10%
	Phantom Dancer E	Increases movement speed by 15%
	Adrenaline Shot	Temporarily increases movement speed by 45%
	Jumping Bean	Temporarily increases movement speed by 40%
Feats
	Interloper	Reduces Stealth Mode movement speed penalty to 30%	allows retaining of some movement points after Stealth Mode
	Sprint	Increases movement speed by 45%
	Strider E	Increases movement speed by 15%
Status effects
	Stealth Mode	Reduces movement speed by 45%	Stacks multiplicatively with other movement speed modifiers
	Chilled	Decreases movement speed by 12% per stack	12% is approximate. Might be 12.5% or 1/8Verify
	Fatigue	Decreases movement speed by 20%
	Slowed (Sticky Oil)	Decreases movement speed by 20-69%
	Slowed (Web)	Decreases movement speed by 50%
	Lightly Encumbered	Decreases movement speed by up to 50%
	Heavily Encumbered	Decreases movement speed by up to 70%
	Completely Encumbered	Decreases movement speed by 100%	Prevents all movement

Turn-based

This section needs expansion with list of MP sources.

• Character base Movement Points equal 30 + extra 3 points for every point in agility above 5. Movement points can only be used for moving.
• Movement points are affected by agility, armor penalty or bonus, encumberance and some feats.
• Most effects that change movement points also change real-time movement speed.
• Some creatures, such dogs and spawn, have natural bonus to movement points.

Vehicle mechanics

This section needs expansion with Jet Ski stuff.