These are Fire and Ice shields, They are special weapons that can be activated manually by the player, when triggered, 2 Ice shields or 2 Fire shields will orbit the player for 12 seconds, they can remove projectiles from enemies and they Do damage to the enemies but slightly less damage to bosses, and each special weapon has its own properties.
Fire Shields: Cost 60 Keys
Properties: when activated 2 fire shields (orbs) will surround the player’s ship, they can remove projectiles from enemies and when the enemies touch it, they will take high damage overtime, Reduced damage to bosses
The concepts are here:

Ice Shields: Cost 60 Keys
Properties: when activated 2 Ice shields (orbs) will surround the player’s ship, they can also remove projectiles from enemies and when the enemies touch it, they will freeze, thus they won’t move for 4 seconds, if mini-bosses touch them, their movement will be significantly reduced (60% movement speed reduction), Reduced damage to bosses
The concepts are here: