When you choose this archetype at 3rd level, you gain proficiency with smith’s tools, and you learn to speak, read, and write Giant.
Starting at 3rd level, you can use magic runes to enhance your gear. You learn two runes of your choice, from among the runes described below, and each time you gain a level in this class, you can replace one rune you know with a different one from this feature. When you reach certain levels in this class, you learn additional runes, as shown in the Runes Known table.
Runes Known, Fighter Level, Number of Runes
3rd: 2
7th: 3
10th: 4
15th: 5
Whenever you finish a long rest, you can touch a number of objects equal to the number of runes you know, and you inscribe a different rune onto each of the objects. To be eligible, an object must be a weapon, a suit of armor, a shield, a piece of jewelry, or something else you can wear or hold in a hand. Your rune remains on an object until you finish a long rest, and an object can bear only one of your runes at a time.
The following runes are available to you when you learn a rune. If a rune has a level requirement, you must be at least that level in this class to learn the rune. If a rune requires a saving throw, your Rune Magic save DC equals 8 + your proficiency bonus + your Constitution modifier.
Cloud Rune. This rune emulates the deceptive magic used by some cloud giants. While wearing or carrying an object inscribed with this rune, you have advantage on Dexterity (Sleight of Hand) checks and Charisma (Deception) checks.
In addition, when you or a creature you can see within 30 feet of you is hit by an attack roll, you can use your reaction to invoke the rune and choose a different creature within 30 feet of you, other than the attacker. The chosen creature becomes the target of the attack, using the same roll. This magic can transfer the attack's effects regardless of the attack's range. Once you invoke this rune, you can't do so again until you finish a short or long rest.
Fire Rune. This rune's magic channels the masterful craftsmanship of great smiths. While wearing or carrying an object inscribed with this rune, your proficiency bonus is doubled for any ability check you make that uses your proficiency with a tool.
In addition, when you hit a creature with an attack using a weapon, you can invoke the rune to summon fiery shackles: the target takes an extra 2d6 fire damage, and it must succeed on a Strength saving throw or be restrained for 1 minute. While restrained by the shackles, the target takes 2d6 fire damage at the start of each of its turns. The target can repeat the saving throw at the end of each of its turns, banishing the shackles on a success. Once you invoke this rune, you can't do so again until you finish a short or long rest.
Frost Rune. This rune's magic evokes the might of those who survive in the wintry wilderness, such as frost giants. While wearing or carrying an object inscribed with this rune, you have advantage on Wisdom (Animal Handling) checks and Charisma (Intimidation) checks.
In addition, you can invoke the rune as a bonus action to increase your sturdiness. For 10 minutes, you gain a +2 bonus to all ability checks and saving throws that use Strength or Constitution. Once you invoke this rune, you can't do so again until you finish a short or long rest.
Stone Rune. This rune's magic channels the judiciousness associated with stone giants. While wearing or carrying an object inscribed with this rune, you have advantage on Wisdom (Insight) checks, and you have darkvision out to a range of 120 feet.
In addition, when a creature you can see ends its turn within 30 feet of you, you can use your reaction to invoke the rune and force the creature to make a Wisdom saving throw. Unless the save succeeds, the creature is charmed by you for 1 minute. While charmed in this way, the creature has a speed of 0 and is incapacitated, descending into a dreamy stupor. The creature repeats the saving throw at the end of each of its turns, ending the effect on a success. Once you invoke this rune, you can't do so again until you finish a short or long rest.
Hill Rune (7th Level or Higher). This rune's magic bestows a resilience reminiscent of a hill giant. While wearing or carrying an object that bears this rune, you have advantage on saving throws against being poisoned, and you have resistance against poison damage.
In addition, you can invoke the rune as a bonus action, gaining resistance to bludgeoning, piercing, and slashing damage for 1 minute. Once you invoke this rune, you can't do so again until you finish a short or long rest.
Storm Rune (7th Level or Higher). Using this rune, you can glimpse the future like a storm giant seer. While wearing or carrying an object inscribed with this rune, you have advantage on Intelligence (Arcana) checks, and you can't be surprised as long as you aren't incapacitated.
In addition, you can invoke the rune as a bonus action to enter a prophetic state for 1 minute or until you're incapacitated. Until the state ends, when you or another creature you can see within 60 feet of you makes an attack roll, a saving throw, or an ability check, you can use your reaction to cause the roll to have advantage or disadvantage. Once you invoke this rune, you can't do so again until you finish a short or long rest.
At 3rd level, you have learned how to imbue yourself with the might of giants. As a bonus action, you magically gain the following benefits, which last for 1 minute:
If you are smaller than Large, you become Large, along with anything you are wearing. If you lack the room to become Large, your size doesn't change.
You have advantage on Strength checks and Strength saving throws.
Once on each of your turns, one of your attacks with a weapon or an unarmed strike can deal an extra 1d6 damage to a target on a hit.
You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.
At 7th level, you learn to invoke your rune magic to protect your allies. When another creature you can see within 60 feet of you is hit by an attack roll, you can use your reaction to force the attacker to reroll the d20 and use the new roll.
You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
By 10th level, the magic of your runes permanently alters you. When you gain this feature, roll 3d4. You grow a number of inches in height equal to the roll.
Moreover, the extra damage you deal with your Giant's Might feature increases to 1d8.
At 15th level, you can invoke each rune you know from your Rune Carver feature twice, rather than once, and you regain all expended uses when you finish a short or long rest.
At 18th level, you learn how to amplify your rune-powered transformation. As a result, the extra damage you deal with the Giant's Might feature increases to 1d10. Moreover, when you use that feature, your size can increase to Huge, and while you are that size, your reach increases by 5 feet.
Legendary Sub-class
Runic Barrier
Prerequisite: 21st level
When you or a creature within 60-feet of you is hit with an attack, you may expend your reaction to reduce the damage taken to 0. Whenever you use this feature, choose an active Mark you possess. You lose its benefits until you complete a short or long rest.
Mastered Marks
Prerequisite: 21st level
When a mark you know would force a creature to make a saving throw, you may expend a Mastery die to roll it and subtract the result from their saving throw
Everlasting Size
Prerequisite: 23rd level
There is no longer a time limit on your Giants Might feature, and you may use it any number of times between rests
Master Invoker
Prerequisite: 25th level
You become a true adept at invoking the runes. You may invoke a rune you know on your turn without any action, oncer per turn to only one rune
Titan
Prerequisite: 27th level
When you grow from Giants Might, you may choose to become Huge instead of large if there is enough room to do so. If you do, your reach is increased by 10-feet rather than 5, and the damage bonus is 2d10 instead of 1d10. Once you leave your Titanic state, you cannot enter it again until you complete a long rest (But you may still grow to Large size)
Master Rune
Prerequisite 30th level
Finally at 30th level, you have perfected one of your tunes into its purest form... Choose one of the following features, can't be changes after it is chosen
Hill Rune: Permanently under it effects while in Giants Might
Frost Rune: Permanently under it effects while in Giants Might
Storm Rune: Permanently under it effects while in Giants Might
Fire Rune: +1d10 Fire damage when in Giants Might
Cloud Rune: Creatures not immune to the charmed condition has DISADV against when in Giants Might