The weave blood is inherently connected to the weave and while many others gain connections to the weave. It flows through you, and you have inherent abilities to bend it to your will. Whereas many spellcasters use formulas to call forth effects from the weave or connections to higher powers or ancient lineages grant a connection, it flows through you and your abilities as a spell caster. 

Weave Speaker

1st Level Weave blood ability:
You gain the ability to re-channel your connection to the weave and call it to respond in any way that you desire, you can prepare spells from all spellcasting classes. Additionally you can expend a spell slot to change the spells you have prepared of that level.  

Protection of the Weave

If you would be taken to 0 hit points by a spell from the same school of magic as the last spell of first level or higher that you cast, as a reaction you make a Charisma saving throw against the spell casters spell save DC. If you succeed the spell fails to take effect 

Additionally, when you cast a spell you can call the weave to maintain the spell against the intent of other spell casters. You can expend 2 sorcery points to make your spell surpass magical interference including counterspell, dispel magic, shield, and mage armour. This can cause the spell to maintain if targeted by an anti-magic cone however a spell originating in that area will still fail to take affect.

Arcane Call

You gain the ability to call forth magic that you have not prepared, once per long rest you can cast any spell as an action without expending a spell slot, provided that the spell is of your maximum spell level -2. This effect forgoes the need for components, however the material cost must be met before the end of your next long rest. If this does not happen, you do not regain use of this ability and all spells will consume the material components they require.

Arcane Bolster

Your body is so used to magic that you can maintain strong magics coursing through your blood, Now on every turn you can cast up to 9 levels in spells rather than  just 1 spell and 1 cantrip. These must follow all other rules of spellcasting, In addition, you can concentrate on two spells at once however you must make a DC 10+(the number of rounds you have been concentrating) concentration check with disadvantage at the start of each of your turns. If you fail this check, you lose both spells.

Weave Favour

Over the course of an hour you can meditate in to the weave and attempt to redirect its path, and shape it. At the end of the hour you make a DC20 Charisma Saving throw, on A success you can name a school of Magic, and sever its connection to the material plane. This lasts until the next dawn

You take a level of exhaustion on a success or a failure 

While the connection is severed all magic from that school fails as the weave resists its pull, any permanent effects lose their magic for the period, the magic returns with the new dawn. Any non permanent effects are ended by this effect. A spell caster attempting to cast a spell of this kind will not lose their spell slot as they find no essence of the weave to pull upon, however they do waste the action needed to cast it.