Crystallize 
Crystallize is the Elemental Reaction triggered when Geo is applied onto an entity already affected by Pyro/Electro/Hydro/Cryo.
Crystallize deals no damage. Instead, it generates a matching Pyro, Electro, Hydro, or Cryo Elemental Shard in front of the entity that can be picked up to gain an Crystallize Shield of the corresponding element.
Elemental Shard 
Elemental Shards last on the field for 15 seconds, and can be picked up to gain an Crystallize Shield of the corresponding element.

Elemental Shards can only be picked up by the entity that triggered Crystallize for 7.5 seconds. After this duration, the Elemental Shard can be picked up by any entity, including the entity Crystallize was triggered on.
Crystallize Shield 
When you are about to take damage, the incoming damage is absorbed by the Crystallize Shield so long as it has health left. When incoming damage is absorbed by the Crystallize Shield, you will not take damage knockback, Once the Crystallize Shield expires or is broken, you will receive DMG and knockback normally again.
If a Crystallize shield doesn't have enough health to fully absorb the damage received, the excess damage left is dealt to you. Excess damage wil not apply knockback.
Shields made from the other elements (Pyro, Hydro, Electro, etc.) all have 250% "effectiveness" against DMG from their corresponding element.
Geo Shields have 150% "effectiveness" against DMG from their corresponding element.
For sister elements (Frozen, Quicken, Burning), they also have 250% "effectiveness" against DMG from their corresponding element. However, this does not apply to their correspoding parent elements, i.e. Frozen only has 100% effectiveness against Cryo DMG, and likewise vice versa, i.e. Cryo only has 100% effectiveness against Frozen DMG.
It is also important to note that you, under any circumstance, should never be taking DMG from sister elements in a normal playthrough.
A shield's "effectiveness" determines how well it absorbs DMG from that element. The DMG Crystallize Shields take is given by the formula below:
where 
For instance, when an Electro Crystallize Shield receives Electro DMG, it's only damaged by 40% of the original Electro DMG 
If the damage exceeds the Crystallize Shield's health, the excess DMG is dealt to you, which is given by the formula below:
The Crystallize Shield does not apply its effectiveness on the excess DMG.
Internal Data 
Reaction Multiplier (Crystallize Shield Health): 1
 Reaction ID(s):
- seven-elements:crystallize_pyro(triggered on the Pyro aura)
- seven-elements:crystallize_hydro(triggered on the Hydro aura)
- seven-elements:crystallize_electro(triggered on the Electro aura)
- seven-elements:crystallize_cryo(triggered on the Cryo aura)
- seven-elements:crystallize_frozen(triggered on the Freeze aura)
