At Thirteen Floor Su Is Find Out Tower Thirteen Floor Filled With 3000 Level 30 Time Type Monster So Su Is Summon Chronos Dragon Rank Commander Level 50 And Clear Tower Thirteen Floor Then Enter Tower Fourtheen Floor Filled With 4000 Level 40 Gravity Type Monster So Su Is Summon Vector Dragon Rank Soldier Level 50 And Clear Tower Then Su Is Enter Fifteen Floor There He Is Find Out Tower Fifteen Floor Filled With 5000 Level 50 Light Type Monster So Su Is Summon His Dragon Absolute Judgment Dragon And Clear Tower Then Pass Exam