I found a way to surpass 15 star tyrant gear with star force
when transferring tyrant gear to sweet water gear the new sweet water gear lost the power of superior also 1 star decrease which is good news for star force . which mean I can use starforce to get more stats from 14 star to 22 star and 15-22 star is MEE like which mean that 15 star tyrant can have like 300 attack and the final star
once my tyrant reach 15 star I will xfer it power to sweet water at the cost of giving up the power to trade also resetting potential but allow me to increase potential tier to the 4th level also allow me to have sweetwater set effect grand huge amount of stats and attack with other tyrant such as shoes/cape /gloves 15 star also becoming sweet water set effect...
overall power gain from 3 tyrant 15 star gloves/shoes/cape to 22 star sweet water gloves/shoes/cape
total stats gain 500 attack and 400 stats to all excluding 4tier potential just from that at the cost of becoming perm untradeable
do you think is it worth doing this to go beyond? the limit