Fall Potion – Effect Formulas (v1.2.0+mc1.21.11)

All effects apply only when the entity has the status effect fall-potion:fall_effect.
The amplifier level a is the effect level (0, 1, 2, …).

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Changes from Previous Version (hardcoded values → linear scaling)

• Before (v1.0.x): Fall damage multiplier was fixed (e.g., I=2×, II=4×).
  Jump height and gravity were also fixed per potion type.
• Now (v1.2.0+): All effects scale linearly with the amplifier level.
  This allows any level (0–255) to have proportionally stronger/weaker effects, and enables commands like /effect give @p fall-potion:fall_effect 60 5 true to give a custom strength.

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1. Fall Damage Multiplier

Formula: multiplier = a + 1

Final fall damage = original damage × multiplier.

Amplifier (a)	Multiplier
0	1
1	2
2	3
3	4
...	...

Note: No base multiplier; damage increases by +100% per level.

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2. Safe Fall Distance Reduction

The raw fall distance is increased before damage calculation, effectively lowering the safe threshold.

Formula:

• If a = 0 → increment = 0
• If 1 ≤ a ≤ 3 → increment = 5.5
• If a ≥ 4 → increment = 6.0

Modified fall distance = original fall distance + increment.
Effective safe distance = 3 - increment.

Amplifier (a)	Increment	Effective Safe Distance
0	0.0	3.0 (vanilla)
1 – 3	5.5	-2.5 (any fall hurts)
≥4	6.0	-3.0 (even more severe)

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3. Gravity Acceleration (during free fall)

When the entity is airborne and moving downward (vertical velocity < 0), the downward speed is multiplied by:

Formula: gravity multiplier = 1 + 0.05 × (a + 1)

Amplifier (a)	Gravity Multiplier
0	1.05
1	1.10
2	1.15
3	1.20
...	...

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4. Jump Height Reduction

The initial upward velocity when jumping is reduced:

Formula: jump factor = max(0.2, 0.76 - 0.05 × a)

Jump velocity = 0.42 × jump factor (vanilla jump velocity ≈ 0.42).
Actual jump height ≈ (velocity)^2, so the relationship is quadratic.

Amplifier (a)	Jump Factor	Approx. Jump Height (vanilla = 1.25 blocks)
0	0.76	~0.95 blocks (76%)
1	0.71	~0.89 blocks (71%)
2	0.66	~0.83 blocks (66%)
3	0.61	~0.76 blocks (61%)
...	...	...
≥12	0.20 (min)	~0.25 blocks (20%)

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Implemented in LivingEntityMixin for Minecraft 1.21.11 (Fall Potion v1.2.0+mc1.21.11).