The archetypal Arcane Colossus combines the martial mastery common to all fighters with a careful study of magic. Arcane Colossi use magical talents imbued within them via exposure to magical or mystical properties similar to sorcerers. 

Spellcasting

When you reach 3rd level, you augment your martial prowess with the ability to cast spells. See Spells Rules for the general rules of spellcasting and the Spells Listing for the Sorcerer spell list.

Cantrips

You learn two cantrips of your choice from the Sorcerer spell list. You learn an additional Sorcerer cantrip of your choice at 10th level.

Spell Slots

The Arcane Colossus Spellcasting table shows how many spell slots you have to cast your Sorcerer spells of 1st level and higher. To cast one of these spells, you must expend a slot of the spell’s level or higher. You regain all expended spell slots when you finish a long rest.

For example, if you know the 1st-level spell shield and have a 1st-level and a 2nd-level spell slot available, you can cast shield using either slot.

Spells Known of 1st-Level and Higher

You know three 1st-level Sorcerer spells of your choice.

The Spells Known column of the Arcane Colossus Spellcasting table shows when you learn more wizard spells of 1st level or higher. Each of these spells must be of a level for which you have spell slots. For instance, when you reach 7th level in this class, you can learn one new spell of 1st or 2nd level.

Whenever you gain a level in this class, you can replace one of the Sorcerer spells you know with another spell of your choice from the sorcerer spell list. The new spell must be of a level for which you have spell slots.

Spellcasting Ability

Charisma is your spellcasting ability for your Sorcerer spells, since you unlock spells through gained talent. You use your Charisma whenever a spell refers to your spellcasting ability. In addition, you use your Charisma modifier when setting the saving throw DC for a sorcerer spell you cast and when making an attack roll with one.

Spell save DC = 8 + your proficiency bonus + your Charisma modifier

Spell attack modifier = your proficiency bonus + your Charisma modifier

Arcane Colossus Spellcasting

Spellcasting

The archetypal Arcane Colossus combines the martial mastery common to all fighters with a careful study of magic. Arcane Colossi use magical talents imbued within them via exposure to magical or mystical properties similar to sorcerers. 

Spellcasting

When you reach 3rd level, you augment your martial prowess with the ability to cast spells. See Spells Rules for the general rules of spellcasting and the Spells Listing for the Sorcerer spell list.

Cantrips

You learn two cantrips of your choice from the Sorcerer spell list. You learn an additional Sorcerer cantrip of your choice at 10th level.

Spell Slots

The Arcane Colossus Spellcasting table shows how many spell slots you have to cast your Sorcerer spells of 1st level and higher. To cast one of these spells, you must expend a slot of the spell’s level or higher. You regain all expended spell slots when you finish a long rest.

For example, if you know spell shield and have a 1st-level and a 2nd-level spell slot available, you can cast shield using either slot.

Spells Known of 1st-Level and Higher

You know three 1st-level Sorcerer spells of your choice.

The Spells Known column of the Arcane Colossus Spellcasting table shows when you learn more wizard spells of 1st level or higher. Each of these spells must be of a level for which you have spell slots. For instance, when you reach 7th level in this class, you can learn one new spell of 1st or 2nd level.

Whenever you gain a level in this class, you can replace one of the Sorcerer spells you know with another spell of your choice from the sorcerer spell list. The new spell must be of a level for which you have spell slots.

Spellcasting Ability

Charisma is your spellcasting ability for your Sorcerer spells, since you unlock spells through gained talent. You use your Charisma whenever a spell refers to your spellcasting ability. In addition, you use your Charisma modifier when setting the saving throw DC for a sorcerer spell you cast and when making an attack roll with one.

Spell save DC = 8 + your proficiency bonus + your Charisma modifier

Spell attack modifier = your proficiency bonus + your Charisma modifier

Arcane Colossus Spellcasting

 

FIGHTER LEVEL	CANTRIPS KNOWN	SPELLS KNOWN	— SPELL SLOTS PER SPELL LEVEL —
			1ST	2ND	3RD	4TH
3rd	2	3	2	—	—	—
4th	2	4	3	—	—	—
5th	2	4	3	—	—	—
6th	2	4	3	—	—	—
7th	2	5	4	2	—	—
8th	2	6	4	2	—	—
9th	2	6	4	2	—	—
10th	3	7	4	3	—	—
11th	3	8	4	3	—	—
12th	3	8	4	3	—	—
13th	3	9	4	3	2	—
14th	3	10	4	3	2	—
15th	3	10	4	3	2	—
16th	3	11	4	3	3	—
17th	3	11	4	3	3	—
18th	3	11	4	3	3	—
19th	3	12	4	3	3	1
20th	3	13	4	3	3	1

Second Skin

Beginning when you choose this archetype at 3rd level, as an action, you can gain a base AC of 13 + your Constitution modifier if you aren’t wearing armor, and your skin assumes a metallic appearance. This effect lasts until you end it as a bonus action, you are incapacitated, or you don armor other than a shield.

Inanimate Bond

Also beginning at third level, you learn a bonding ritual that lets you assimilate metal weapons and metal shields. You perform the ritual over the course of 1 hour, which can be done during a short rest. The equipment must be within your reach throughout the ritual, at the conclusion of which you touch the item and forge the bond. You can then dismiss the item, causing it to harmlessly meld and fuse into your skin, blood, or bones, as a bonus action on your turn.

Once you have bonded the item to yourself, you have advantage on all saving throws and checks to be disarmed of it as it fuses with your hands. As an action on your turn, if the item is melded or fused into your skin, blood, or bones you can summon the item causing it to form instantly to your hand. Shields summoned this way are automatically donned. You can have up to two bonded weapons or shields, but can summon only one at a time with your action. If you attempt to bond with a third weapon, you must break the bond with one of the other two.

Finally, while touching your bonded weapon or bonded shield, you can change its color and style in minor ways after spending 10 minutes performing a magical ritual that manipulates its metallic structure. This cannot change how these items are worn, carried, or function. The changes made to the item fade away if you break the bond with the item.

Arcane Adaptation

Beginning at 7th level, when you use your action to cast a cantrip, you can make one weapon attack as a bonus action.

Advanced Bonding

At 10th level, you have learned the process to compress bonded weapons. As such you gain the ability to bond one additional weapon or shield.

Bonded Critical

Starting at 15th level, your weapon attacks score a critical hit on a roll of 19–20.

Arcane Knight