Blood Demon

"I Call you, oh the mighty ones, to aid me against my foes, show them the power of Ancient gods and devils"

Vukasin Popovic In Infernal 

You sacrifice 1d8 + your Constitution modifier hp in order to summon a lesser Blood Demon, once summoned you can use your bonus action to command its movement and action. The Demon has Hp equal of 1d10 + your spell casting modifier - your constitution modifier.

• If the Summoner is C/any (Chaotic) the Demon has resistance to Necrotic and Poison damage.
• If the Summoner is L/any (Lawful) the Demon has resistance to Fire and Thunder damage.
• If the summoner is N/any (Neutral) the Demon has resistance to Force and Cold damage.
• The Demon's Ac (Armor Class) is equal to your AC - 1.
• The Demon's attack is unarmed (+5 to hit) and its damage (1d6) is Piercing.

When you reach level 10 add another 1d10 to Demon's Hp, another 1d6 to its damage, and another 2d8 to your sacrificed Hp.

When you reach level 15 add another 2d10 to Demon's Hp, another 2d6 to its damage, and another 2d8 to your sacrificed Hp.

When you reach level 20 add another 2d10 to Demon's Hp, another 2d6 to its damage, and another 2d8 to your sacrificed Hp.