Blood Amniote

Fast Healing. The blood amniote regains 10 hit points at the start of its turn. If the blood amniote starts its turn with 0 hit points, it dies and does not regain hit points.

Self Spawn. If a blood amniote, during its existence, reduces the maximum hit points of creatures by an amount equal to its own normal maximum hit points (usually 115hp), it self spawns, splitting into two blood amniotes. This first has the current hit points of the original, while the second has its full maximum hit points. Any ongoing spells or effects that were active on the original blood amniote are still in effect on the first new blood amniote. 

Spider Climb. The blood amniote can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Slam. Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 12 (2d6+5) bludgeoning damage.

If the target is a creature -- and not a construct, plant, ooze, or undead -- its touch causes the target's body to expel a portion of its own blood through its pores. The expelled blood gathers and flows across the intervening distance between the target and the blood amniote. The target must succeed on a DC 16 Constitution saving throw or its maximum hit points are reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.