During times of when things look bleak youve learned to tap into an inner rage unleashing your saiyan form. When your hitpoints are  30 or below you can activate this ability as a bonus action once per long rest. This ability lasts one minute and during that time you cant cast normal spells only Saiyan spells that use chi. however you can maintain concentration of a spell if it was cast priorly to your transformation.. 

• Once youve entered Saiyan form you instantly gain a flat 20 temp HP.
• Your speed is increased to 45 feet per round
• You  can perform 2 unarmed strikes as a single attack action, these unarmed strikes do 1d8+ strength mod+ proficiency modifier +1, and the attack rolls are str mod + prof mod +1
• you are resistant to non magical bludgeoning, piercing, and slashing damage.