Well I decided to try Infinito Challenge Level 144 and well I fail the first try but I manage to do it on the second try. The 2nd boss was the Moon Knight. Which was easy to kill since I just got a Improved Heavy Stinger Ring + Weapon Master Ring. So my main team was Sirius and yes I did upgraded my Sirius. I currently have an Armonia 1h Sword with ATK 46/ATK SPD 5%/Daemon 91%/HP+4, A Enhanced Garim Belt +9ed, and I rechipped his Shield with a better Daemon mod. Then my Kess with his Trusty IBR +7ed ATK 44/ATK SPD 28/Heavy ATK 90%. Then I finish off with my Recruitable Elisa. I've decided not to even try level 145 or above. Some players told me it's not worth it because with +8 Greek Croma's it won't even matter LOL.