Discuss Divinity Original Sin, as well as comments posted to our Divinity Original Sin Wiki and Divinity Original Sin 2 Wiki
By Anonymous
A very important spell for getting blood incarnates and blood totems, usually I use this before the battle starts to set up a blood pool for blood for my summoners.

Otherwise, the only reliable way to get blood is the elf's flesh sacrifice.
By Anonymous
You can also use Raise Bloated Corpse and explode it with Vile Burst in order to get a large pool of blood.