Evocation — Pressure

Pressure is the Evocation Method concerned with altering air density and force. It is subtle, dangerous, and often lethal. Pressure does not create energy — it redistributes it.

Threads (Pressure)

• Barrier — hardens air into a resisting surface.
• Vacuum — removes breathable air and induces suffocation.
• Bubble — isolates and refreshes a pocket of air.

Base Ka Cost (Pressure)

Thread	Effect	Base Ka
Barrier	Hardened air panel — stops a single strike or blocks a doorway	2
Bubble	Small pocket of breathable air, one person	2
Vacuum	Localized vacuum on a single target — begins suffocation	5

Scale

Scope	Ka Modifier	TD Modifier
Single target or point	+0	+0
Small group / room-sized	+3	+3
Structural / area-wide	+6	+6

Duration

Duration	Modifier
Instant / single use	+0
One scene	+2 Ka
Sustained (active Channeling)	Ka paid per interval
Persistent	Enchanting required

Channeling Difficulty (Pressure)

Modifiers: - Small, contained space: +0 - Open air, nothing to anchor against: +2 - Resisting or moving target: +2 - Sustaining a large or structural effect: +4

Vacuum and Harm

Vacuum does not resolve as a single Impact roll. Each interval of continued suffocation, the target suffers escalating Impact (Strain, then Impact 1, then Impact 2, and so on) until freed or the effect ends. A target may hold their breath briefly to delay onset, at GM discretion.

Force and Impact

Barrier used to block a blow, or Vacuum used to harm directly, follows Evocation#Ka and Force — Ka spent becomes Evocation Force. Bubble is purely protective and never requires an Impact roll.

Burn

Burn may be taken to: - prevent a Barrier or Bubble from collapsing when overloaded - force a Vacuum past resistance for one interval - stabilize a pocket of pressure through violent movement

Failure

Pressure effects fail by collapse, not explosion — a Barrier cracks, a Bubble ruptures, a Vacuum equalizes suddenly. A failed Vacuum or Barrier under strain can still cause harm to those nearby as pressure re-balances.