To understand how to read entries, consider an example as below:

Originally posted by Piengineer's Encyclopedia of Material Stacking and Spellpower Effects:

Evercold Ice <-- 1

Internally known as "FREEZE_MAT" <-- 2

Enemy Slowdown (%) <-- 3

Source

Effect

Effect per SP

First

+10 <-- 4

Every F

+20 <-- 5

+0.175 <-- 6

Every D

+24

+0.210

Every C

+28

+0.245

Every B

+32

+0.280

Every A

+36

+0.315

Maximum

99 <-- 7

[Robe] Shield Delay (seconds)

Source

Effect

First

3

[Robe] Maximum Shield

Source

Effect

Every F

+5

Every D

+10

Every C

+15

Every B

+20

Every A

+25

Note: Shield regeneration is 5 per second <-- 8

1: Material name.
2: Material information.
3: Material effect. All effects NOT prefixed with [Robe] affect wands / spells.
4: First material bonus: the first material slotted into the wand / spell will give an additional bonus.
5: Effect per material grade slotted. In this case, a Grade F Evercold Ice will grant +20% slowdown.
6: Additional effect per spellpower (SP) per material grade slotted. In this case, a Grade F Evercold Ice will grant an additional +0.175% slowdown per SP.
7: Max/Min effect. In this case, the maximum slowdown permitted is 99%.
8: Other information.

As an example, if a Grade A Evercold Ice is slotted onto a wand with 10 SP, then the following math applies (refer to the table above):
1. First material bonus: +10%
2. Grade A bonus: +36%
3. Grade A, 10 SP bonus: +0.315% * 10 = +3.15%
Final slowdown: 10% + 36% + 3.15% = 49.15%

If a Grade B Evercold Ice is added to the wand plus other materials that increase the wand's SP by 200%, then the whole calculation is:
1. Calculate the SP of the wand. In this case it will have 30 SP.
2. First material bonus: +10%
3. Grade A bonus: +36%
4. Grade A, 30 SP bonus: +0.315% * 30 = +9.45%
5. Grade B bonus: +32%
6. Grade B, 30 SP bonus: +0.280% * 30 = +8.40%
Final slowdown: 10% + 36% + 9.45% + 32% + 8.40% = 95.85%

If a Grade A Evercold Ice was slotted onto a robe, then the following math applies:
1. First material bonus: 3 sec shield delay and no maximum shield bonus
2. Grade A bonus: no shield delay bonus and +25 maximum shield
Final effect: 25 shield and 3 sec shield delay

Note that sometimes the wrong percentage will be displayed on the HUD (To do: why?). It appears that this is only the case for the Evercold Ice and Caustic Ichor materials (verification needed).

All distances are measured in magicmeters. The length of 1 tile = 1 magicmeter.

IMPORTANT! A wand's / spell's base damage is equal to its SP. Wands have a base SP of 10 while spells have a base SP of 100. A wand / spell acting as an enchantment will gain x3 base SP, but will have a base damage of 0.

Internally known as "CRIT_MAT"

Critical Damage (%)

Critical Chance (%)

[Robe] Maximum Overheal

[Robe] Overheal Decay


Internally known as "BOUNCE_MAT"

Maximum Wall Bounces

[Robe] Elasticity (%)


Internally known as "TRACER_MAT"

Marked Target Damage Boost (%)

[Robe] Target Reselection Timer (seconds)

[Robe] Marked Target Damage Boost (%)


Internally known as "DIRECTIONCHANGE_MAT"

SP Boost Per Redirection (%)

Redirection Delay (seconds)

[Robe] Random Reroll Timer (seconds)

[Robe] Random Bonus (%)


Internally known as "HOMING_MAT"

Homing Power (magicmeters per second?)

[Robe] Loot Detection Radius (magicmeters)

Internally known as "PENETRATE_MAT"

Reduction Per Hit (%) (To do: no effect?)

Maximum Hits

[Robe] Knockback Reduction While Moving (%)
Note: Immune to knockback while not moving


Internally known as "MANASTEAL_MAT"

Mana Cost
Note: x0.1 on wands

Mana Bar Restoration (%)

[Robe] Maximum Mana


Internally known as "FREEZE_MAT"

Enemy Slowdown (%)

[Robe] Shield Delay (seconds)

[Robe] Shield Amount
Note: Shield regeneration is 5 per second


Internally known as "AOE_MAT"

Explosion Distance Falloff Power (To do: what does this mean, and how is this used?)

Explosion Radius (magicmeters)

[Robe] Death Explosion Delay (seconds)

[Robe] Death Explosion Damage


Internally known as "ROLL_MAT"

Charge Time (seconds)

SP Boost (%)

[Robe] Raincloud Damage
Note: 40(?) drops are created per second

Internally known as "RAPIDFIRE_MAT"

Fire Rate (per second)

Damage

[Robe] Additional Jumps


Internally known as "FIRE_MAT"

Fire Damage

[Robe] Fire Trail Duration (seconds)

[Robe] Fire Trail Damage (per second)


Internally known as "THREE_POINT_STRIKE_MAT"

Bonus Damage

Non-Bonus Damage (%)

[Robe] Minimum Run Distance (magicmeters)

[Robe] Run Stop Explosion Damage


Internally known as "MAXHPREDUCE_MAT"

Execution Buildup

[Robe] Maximum Health


Internally known as "KNOCKBACK_MAT"

Collision Damage for Remaining Knockback? (per magicmeter)

Knockback Distance (magicmeters)

[Robe] Fall Slowdown (%)

Internally known as "MULTI_MAT"

Extra Shots

SP Reduction (%)

[Robe] Doublecast Spell Delay


Internally known as "ARC_MAT"

Arc SP Reduction (%)

Arc Maximum Range (magicmeters)

[Robe] Maximum Projectile Shield Size (magicmeters)


Internally known as "BOOMERANG_MAT"

[Robe] Pushback Charge Time (seconds)

Spell Mana Refund (%)

[Robe] Maximum Pushback Charges


Internally known as "CONSTANT_AOE_MAT"

Aura Radius (magicmeters)

Aura Damage (per second)

[Robe] Aura Radius (magicmeters)

[Robe] Aura Damage (per second)

Internally known as "MINION_MAT"

Minion Health

Minion Damage

[Robe] Crow Flock Size
Note: Each crow deals 1 damage


Internally known as "MELEE_MAT"

Spell Range (%)

Spell Damage (%)

[Robe] Dash Distance (magicmeters)

[Robe] Dash Damage


Internally known as "POISON_MAT"

Maximum Stacks

Damage (per second)
Note: Poison lasts for 5 seconds

[Robe] Poison Trail Duration (seconds)

[Robe] Poison Trail Damage (per second)

Internally known as "CURSE_MAT"

Curse Damage Per Hit

Curse Explosion Radius (magicmeters)

[Robe] Maximum Stacks To Negate?

[Robe] Negation Shield Charge Delay (seconds)


Internally known as "LASER_MAT"

Laser Width
WARNING! Causes changes to certain materials, see section New Material Effects due to Optic Lens for more information.

[Robe] Light Beam Length (magicmeters)


Internally known as "TRAP_MAT"

Trap Activation Delay (seconds)

Trap Duration (seconds)

[Robe] Damage Reduction While Not Moving (%)

Internally known as "MPTURBO_MAT"

Mana Cost
Note: x0.1 on wands

SP Boost (%)

[Robe] Mana Shield Damage Prevention (%)


Internally known as "DELAY_MAT"

Velocity (magicmeters per second)

[Robe] Movement Speed (magicmeters per second)


Internally known as "AMMO_MAT"

Mana Cost

Ammunition

[Robe] Damage Negation Charges

Internally known as "LIGHT_MAT"

Glow Radius (magicmeters)

SP Boost (%)

[Robe] Sight Radius (magicmeters)


Internally known as "SELFKNOCKBACK_MAT"

Knockback Velocity (magicmeters per second)
Note: You deal damage to nearby enemies equal to your velocity while knocked back

SP Boost (%)

[Robe] Hurt SP Boost (%)


Internally known as "TELEPORT_MAT"

Distance (magicmeters)

[Robe] Dodge Chance (%)


Internally known as "WALLPASS_MAT"

Duration (seconds)

[Robe] Shockwave Damage

[Robe] Shockwave Range (magicmeters)


Internally known as "MANACRYSTAL_MAT"

Mana Crystals Per Hit

[Robe] Mana Cost Reduction Per Cast (%)

[Robe] Maximum Mana Cost Reduction (%)

Internally known as "MORTAR_MAT"

Projectiles

SP Reduction After Split (%)

[Robe] Hurt Explosion Damage

[Robe] Hurt Explosion Range (magicmeters)


Internally known as "FEAR_MAT"

Control Duration (seconds)

Control Buildup

[Robe] Invisibility Delay (seconds)
Note: Delay resets if a spell was cast or damage was taken

Internally known as "WAVE_MAT"

Wave Width (magicmeters)

Mana Cost (%)

[Robe] Reflection Charge Time (seconds)

[Robe] Maximum Reflection Charges


Internally known as "CONSUME_MAT"

Health Cost (% of Mana Cost)

SP Boost (%)

[Robe] Health Threshold (%)

[Robe] Mana Regeneration On Low Health (per second)
Note: Default Mana Regeneration is 8 per second


Internally known as "TRAIL_MAT"

Trail SP Reduction (%)

Trail Duration (seconds)

[Robe] Illusion Spawn Delay (seconds)
Note: Illusions attract enemy aggro

[Robe] Illusion Damage


Internally known as "WALLFOLLOW_MAT"

Wall-Hug Duration (seconds)

[Robe] Wallwalk Duration (seconds)


Internally known as "HASTE_MAT"

Haste Duration (seconds)

Haste (%)

[Robe] Health Threshold (%)

[Robe] Time Slow Duration On Low Health (seconds)

Internally known as "BALLISTIC_MAT"

Gravity Effect (%)

SP Boost (%)

[Robe] Damage Boost While Not Moving (%)


Internally known as "RICOCHET_MAT"

SP Reduction Per Hit (%)

Ricochet Hits

[Robe] Self-Knockback (%)


Internally known as "PULL_MAT"

Pull Power (magicmeters per second)

Pull Radius (magicmeters)

[Robe] Loot Pull Radius (magicmeters)


Internally known as "LIFESTEAL_MAT"

Health Bar Restoration (%)

[Robe] Healing Boost (%)


Internally known as "TURRET_MAT"

Turret Shots

??? (To do: what does this affect?)

[Robe] Turret Fire Rate (per second)

[Robe] Turret Damage

SP Boost Per Redirection (%)

Distance Per Redirection (magicmeters)


Charge Time (seconds) (verification needed)

SP Boost (%)


Distance (magicmeters)


Maximum Beam Portion (%)


Mana Crystals Per Hit


Trap Duration (seconds)

Trap SP Reduction (%)


Wall-Hug Beam Distance (%)

The text file used to store a drafted copy of the guide text is more than 50 KB large containing more than 1.7 thousand lines, so I am fully aware that a few parts may be incomplete and/or in need of improvements. If you have any suggestions to improve upon this guide, leave them in the comment section down below.

Thank you all for your support.