Bone Dragon

Rebellius. Unless 5 sesions has passed since the lich was created or it's master has the object Undead's crown then every time the lich is ordered to do something, you roll a d20 Intelligence. if the result is 10 or less, this undead will attack you Three times before you can control it again.

Adaptable. The bone dragon does not need to breath.

Legendary Resistance (3/Day, or 5/Day). If the bone dragon fails a saving throw, it can choose to succeed instead.

Mental Strenght Draining. This undead requires 50 of its master's mental strenght to work.

Controlled Undead. Because this undead is made by a necromancer, it needs of it to "live". If its master isnt in a radius of 600 ft all of its stats are reduced to 0 except for its CON, Defense and HP (Hit Points). It also can't move nor make actions.

King Orders. If the necromancer who owns this undead has the magic item "Undead's Crown", the trait "Controlled Undead" is eliminated permanently.

Blasphemous Existence. If attacked by a divine/sacred source from a religion that hates beings from hell or see revived corpses as blasphemy the damage taken is multiplied by 2.

Factory's cuality. Depending on the necromancers luck while making the undead it can have 3 cualities. Bad: All it's 6 stats are divided by 2 (if the number is unpair then it goes half up. Example: 9 divided 2 = 5), Normal:Normal stats, Excellent: all its 6 stats are multiplied by 2 (if the number is unpair then it goes half down. Example: 9 divided 2 = 4)

Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Melf’s Acid Arrow (level 4 version).

Rend. Melee Attack Roll: +15, reach 15 ft. Hit: 17 (2d8 + 8) Slashing damage plus 9 (2d8) Acid damage.

Necrotic Breath (Recharge 5–6). Dexterity Saving Throw: DC 22, each creature in a 90-foot-long, 10-foot-wide Line. Failure: 67 (15d8) Necrotic damage. Success: Half damage.

Spellcasting. The bone dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 21, +13 to hit with spell attacks):

At Will: Detect Magic, Fear, Melf’s Acid Arrow (level 4 version)
1/Day Each: Speak with Dead, Vitriolic Sphere (level 5 version)

Legendary Action Uses: 3. Immediately after another creature's turn , the dragon can expend a use to take one of the following actions. The dragon regains all expended uses at the start of each its turns.

Cloud of Insects. Dexterity Saving Throw: DC 21, one creature the bone dragon can see within 120 feet. Failure: 33 (6d10) Poison damage, and the target has Disadvantage on saving throws to maintain Concentration until the end of its next turn. Failure or Success: The dragon can’t take this action again until the start of its next turn.

Frightful Presence. The bone dragon uses Spellcasting to cast Fear. The dragon can’t take this action again until the start of its next turn.

Pounce. The bone dragon moves up to half its Speed, and it makes one Rend attack.