Custom skeleton

This spell creates an undead servant. Select a pile of bones within range. First the body must be made. It requires 2 lb of bone for each pound of its body which is determined by the DM you can cover the creatures body in spikes at a cost of 4lb of bones for each foot of surface area that you want to cover in spikes use normal surface area / 4 due to the spaced apart bones. Spikes provide +1 ac if you cover at least 3/4 of the creatures body and the creature can make a spike attack as a bonus action with an attack bonus equal to your proficiency bonus add it's strength or dexterity modifier. On a hit it deals piercing damage equal to 1d4 if it is tiny 1d6 if it is small 1d8 if it is medium 1d12 if it is large 2d10 if it is huge and 3d12 if it is gargantuan. When it succeeds on a grapple check it deals piercing damage to the grappled creature equal to 1 if it is tiny 1d4 if it is small 1d8 if it is medium 1d12 if it is large 2d10 if it is huge and 3d12 if it is gargantuan . If a creature covered entirely in spikes is hit by a melee weapon attack it can deal 5 piercing damage to the creature as a reaction. You can also add other body parts to the creature such as a trolls head to get regeneration, a ropers tendrils etc. Adding wings means you need to use wings from a creature one size larger unless you use a similar body to the original creature or if you use dragon wings, which are full of magic. You can add natural weapons such as axes to the creature and they deal 1 damage if it is tiny normal if it is small or medium * 2 if it is large (the dice not the overall damage) *3 if huge and *4 if gargantuan.

Adding a shield or armour also works although if you add spikes they have to cover the armour so instead of 1/4 you have to use normal surface area. Shields have a surface area of 0 if tiny (can't use shields) 2 if small or medium 4 if large 8 if huge and 14 if gargantuan. The creature can also have magic items incorporated into it's weapons and armour. Next you need to determine ability scores. Intelligence starts at four wisdom starts at eight and charisma starts at two. Strength starts at two if tiny eight if small 10 if medium 14 if large 20 if huge and 24 if gargantuan. Dexterity starts at 14 if tiny 12 if small 10 if medium or large 8 if huge and 6 if gargantuan. Constitution starts at 8 if tiny 10 if small or medium 12 if large 18 if huge and 22 if gargantuan .You gain points to distribute equal to your int mod add your proficiency bonus plus your amount of magic items. Each point increases a score by one. You can use teeth and claws from different creatures for your creature they deal the same damage. If you place a liquid inside your creature it can spit out any amount of the doses inside as a ranged attack with a range equal to the creatures con mod times fifty ( minimum of forty feet range) with an attack bonus equal to your proficiency bonus add the creatures dexterity or constitution modifier. It takes 1 hour to originally make a creature but you can also add it as a template so you can cast it using the spells normal casting time. However you can only remember up to your int modifier templates. Finally you need to determine health. The creature has a number of hit die equal to two if tiny four if small or medium eight if large 12 if huge and 15 if gargantuan. The creature has extra hit dice equal to your int mod add your proficiency bonus add its con mod.  

On each of your turns, you can use a bonus action to mentally command any creature you made with this spell if the creature is within 60 feet of you (if you control multiple creatures, you can command any or all of them at the same time, issuing the same command to each one). You decide what action the creature will take and where it will move during its next turn, or you can issue a general command, such as to guard a particular chamber or corridor. If you issue no commands, the creature only defends itself against hostile creatures. Once given an order, the creature continues to follow it until its task is complete creature with an int above five can think independently but it always obeys you..

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, you animate one additional undead creature for each slot level above 6th.