Death dragon

The caster uses their whole turn to cast this spell and by the start of their next turn they are have purple glowing bones appear around the caster like a suit giving them a +2 to AC and until the caster either  dispels the spell or the time runs out the caster also gains the following effects. 

• The caster is now classed as a dragon instead of a humanoid. 
• The caster's unarmed strikes now uses its spell casting modifier for their plus to hit.
• The unarmed strike of the caster deals 2d6 + (the spell casting modifier of the casters) magical slashing damage. 
• The caster can't cast spells that require somatic components. 
• The caster can grapple a target and if the target is living it must make a wisdom saving throw or take 4d6 psychic damage.