Events Siralim Ultimate take place in the lands of Rodia, where there are two kingdoms – Nex and Siralim. For a long time they lived in peace and prosperity, having concluded an alliance with each other. The main character is the ruler of the second country and one day he receives unpleasant news. The Nexa King obtains the Nether Orb. Thanks to this relic, even deities are controlled. And the ruler intends to use his newfound power for the purpose of conquering a country that was once friendly to him. Without hesitation, the protagonist gathers an army and sets out on a campaign against his former friend.

The gameplay journey in Siralim Ultimate is a JRPG, the main feature of which is the battle system. The main character himself can choose one of 30 classes, such as cleric or trickster. However, his main combat power is the 5 monsters traveling with him. Together with them, the protagonist fights in turn-based battles of 6 vs. 6 participants, and then can call one of the defeated opponents to his side. In total there are about 1200 different creatures in the game. In addition, tamed monsters can be combined to create stronger hybrids.

However, in addition to battles, the game has many other activities. Development alone occurs in three directions at once: with the help of artifacts, spell crystals and character levels. Items can be created through a complex crafting system, and materials are obtained from endless procedurally generated dungeons. You are also allowed to make furniture and equip your own palace. This also affects the characteristics and capabilities of the group.