Crystal Soul

(All playable races aside from Elves and Gaialith can choose this sorcerer subclass)

There are people who are unaware their bloodlines contain magic until they become infected with crystalisis and it grows blue, those who learn to live with their infection may choose to harness their magic through it. This dangerous practice does aggravate the infection though, and while it can be a very powerful tool, it comes with a heavy cost.

Crystal Spells
Starting at 1st level, your control over the crystals in your body improves. You learn additional spells when you reach certain levels in this class, as shown on the table below. The spell counts as a sorcerer spell for you, but it doesn’t count against the number of sorcerer spells you know.

Diamond Skin
At 1st level, the crystals that emerge from your body give you natural armour. When you aren't wearing armor, your AC equals 13 + your Dexterity modifier.

Crystal Barrier
At 1st level, you have learnt to absorb excess magic cast by others into your crystals to form a barrier. As a reaction, when a spell of first level or higher is cast within 15 ft. of you, you gain temporary hit points equal to half your sorcerer level rounded up.

Sacrifice
Starting at 6th level, you have learnt how to empower your spells using the crystals in your body, at a cost of your own life force. When you cast a spell of 1st level of higher, you can spend a number of d6, up to your constitution modifier (minimum of 1). You gain a bonus to your spell attack and damage bonus for the next minute equal to the number of dice rolled, but for each dice you spend, you take 1d6 damage, this also reduces your maximum hit points by the same amount, up until your next long rest.

Spell Modulation
At 14th level, you have learnt to enhance or nullify nearby magic through your crystals. As a bonus action you can target one creature within 30ft, when that creature next casts a spell that deals damage, they either deal bonus damage equal to your charisma modifier, or remove damage equal to it, the effect then ends. Each time you use this feature you choose to reduce, or increase the damage dealt. If you use this feature and another creature is already under its effect, the oldest effect is removed.

Crystal Form
Starting at 18th level, you can spend a bonus action to become fully attuned to the crystalline infection growing throughout your body, temporarily covering you like armour, you gain the folllowing benefits. You remain in this form for 1 minute. It ends early if you are incapacitated, if you die, or if you dismiss it as a bonus action.
 * You gain resistance to bludgeoning, piercing and slashing damage.
 * Your AC increases by +3.
 * Spell attacks made against you have disadvantage, and you have advantage on saving throws against spells.
 * You shed bright light in a 10-foot radius and dim light for an additional 10 feet.

Once you use this feature, you can’t use it again until you finish a long rest.