School of Replication (Blue Magic)

Only the most talented and eidetic individuals can harness and apply blue magic. Those who can wield this art of spellcasting can not only learn from their teachers at an increased pace, but also from their own opponents as they take mental note of and inculcate the components of their spells and abilities in the heat of battle. Blue Mages may not be very original in terms of their list of spells available to them, but they are definitely a force to be reckoned with due to their precision and accuracy.

Azure Replication

Beginning when you select this school at 2nd level, you have learned how to recreate the needed components of a spell or ability after seeing it used in front of you. You can still copy written forms of spells into your spellbook despite this. When a creature within 30 feet of you that is hostile to you or your allies uses an action you don't already have copied, you can use your reaction to make an Intelligence (Arcana) check to attempt to memorize how to perform the action. If the action is a spell, the DC for the check equals 15 + the spell's original level. It must be a wizard spell for it to be copied with this feature. If the action is not a spell, the DC for the check equals 15 + the creature's proficiency bonus. On a success, you are able to remember how to replicate the action and can copy it into your spellbook over the course of the next 24 hours. Discuss with your DM how to convert an action duplicated with this feature into a spell, which will count as a wizard spell for you. Regardless of whether or not the action was a spell, the action cannot be legendary to be copied.

You can use this feature a number of times equal to your Intelligence modifier, and regain all expended uses after a long rest.

Blue Mage Training

Also at 2nd level, you gain proficiency with longswords, scimitars, and light armor. You have advantage on Intelligence (Arcana) checks when detecting the presence of and identifying magic or creatures that make use of it.

Arcane Observation

Starting at 6th level, your training in the magical arts of your mentors has heightened your senses to magic, helping you notice abilities that are not performed or casted in front of you. You can use your Azure Replication feature when a creature you can see within 30 feet of you is effected by one of its abilities, such as the Amphibious feature or the Siege Monster feature. The ability cannot be copied if it is legendary.

Adaptive Arsenal

Starting at 10th level, you can broaden your horizons as you learn and continue to grow your power as a Blue Mage. You can now use your Azure Replication feature to copy spells from any class's spell list into your spellbook, and they all count as wizard spells for you.

Master of Replication

Starting at 14th level, your powers of duplication know no bounds. You have come to perfect your your abilities as a Blue Mage, and have become a true mage of legend. You can now use your Azure Replication feature to attempt to copy the legendary actions and abilities of your foes into your spellbook. However, copying a legendary action or legendary ability, such as Legendary Resistance, requires two uses of your Azure Replication due to their immense power.