Amulet of exponential growth

Once after every long rest you may choose to grow to any size you wish from medium to collosal + but once every short rest you may shrink to any size you wish from medium to dimunitive once a month on a full moon you must roll a d8 to determine what size you areyou are moved a distance away from you're party to prevent harm from coming to them ( this amulet also gives you a plus 2 to you're ac multiplied by you're size class [tiny x1 small x2 medium x3 large x4 huge x5 gargantuan x6 collosal x12] it also multiplies you're hp depending on you're size class [tiny x1 small x2 medium x3 large x6 huge x9 gargantuan x12 collosal x15 ] aswell as multiplying you're damage dice [ tiny x3 sneak-attack damage, small x2 sneak-attack damage, medium x2 damage, large x3 damage, huge x4 damage, gargantuan 6x damage, 6x critical damage , and x12 sneak attack damage, collosal x12 damage, x12 crit damage, x24 sneak attack damage ] and the added bonus of you're armor growing with you but you can't use weapons when you are gargantuan or collosal [side note multiply the multipliers for gargantuan by 2 for every plus1 to collosal{ side sidenote that goes up to 16}]) you're allies may climb on you or you're hand to get a higher vantage point you also gain 10,000 feet of tremor sense so you don't accidently crush a city a max size which is collosal+ 16 i hope you enjoy swatting down elder dragons like birds .