Symbiote Summon

You call upon a strange creature from the void, which bonds to you, it adds 10 to your AC ups your STR, DEX, and CON by 10, you are unable to cast spells that require Material, or Concentration while this is active. After the combat has ended you must make a DC17 WIS saving throw or get knocked out to dispell the symbiote, if it is not dispelled you lose control of yourself and will most likely attack your party. While in this form you have a vulnerability to Thunder Damage. As well in this form you are about 50% larger than normal.