Summoning My Way to Invincibility

Every problem has one solution: summon something stronger. Facing an unbeatable matriarch? Summon a legendary warrior. Sect ancestor blocking your path? Summon an ancient god. Demon hordes at the gates? Summon an entire army. With a mysterious check-in system that grants him earth-shattering summoning abilities, our protagonist turns every impossible battle into a one-sided massacre. Why fight fair when you can call forth the most overpowered beings in existence?