Spellweaver

A Spellweaver extensively studies an ancient language in which words of power can be found. Knowing the language from constantly memorizing and applying it, they can weave spells together to create unique outcomes, and cast spells after reaching their limits. Some use these abilities to create lightning bolts that explode when they hit someone, or temporary mansions with light walls protecting the entrance. The possibilities are endless! 

Ancient Dialect

Starting off at 2nd level, you gain access to an ancient and secret language that only other spellweavers can comprehend. Within this language can be the true names of any living creature, though they are always difficult to get from anything. Another part of this language is it's ability to make you unable to lie while speaking in it. Charisma (Deception) checks attempted in this language are always with disadvantage, unless you have practice with speaking in vague riddles.

Magical Fusion

Beggining at level 2, you cast spells in Elestlian. In addition, you may cast two known spells at once, taking up the usual spell slots and material components of both. After doing so, decide which spell it takes the delivery (AoE, Attack roll, etc.) from. Afterwards, the DM will decide the effects of your magical abomination. Affects may vary between DMs, and could change entirely each time you cast it. 

Lie Detector

Being someone that speaks a language in which you cannot lie, you seem to notice when someone is lying much easier now. Starting at level 6, someone who is attempting to decieve you has disadvantage on their roll.

Crippling Spells

At level 10, you may cast a spell without the required spell slots, though your body suffers from the casting. After casting the spell, you take necrotic damage equal to double the spell's level. You cannot cast an enhanced spell in this way.

Names of Power

As soon as you reach level 14, you may make an insight check on any creature once per day. If you succeed, you learn their true name in Elestlian and have control over them when you speak it. The DC is decided by the DM when you choose to attempt this.