1) sources- 1)Yugioh
2) Magic the Gathering
3) Naruto
4) Bleach
5) Witcher
6)One piece
7) Digimon
8) Worm
9) One punch Man
10) God of High school
11) Tekken
12) Dc
13) Fairy tail
14) Megami Tensai
15) Final Fantasy
16) Type Moon
17) JJK
18) Elden Ring
19) Superpower Wiki
20) MHA
2) Items, peoples which roll under 10 will have a time limit of 4 hours, Rolls with count above 15 will be boosted in some way.
3) The exception to Rule 2 is Natural 1s and Natural 20s. On a Natural 20, not only will the summoned item, object, or person be enhanced or in their prime, but some other, positive effect will occur. This could be as simple as producing more of the item, or it could be something entirely unique to the summoned thing. No matter what however, the initial boost will always be positive for the summoner on a Natural 20. A Natural 1, however, can either simply be incredibly weak to the point of uselessness, or depending on what is actually summoned, the summoned thing could instead be just as strong as it would be if summoned by a Natural 20, and will come with an effect of its own. This effect will however be entirely negative to the summoner and possibly the world at large, though not immediately so.
4) Characters summoned by the System will be differentiated based on a few factors, such as personality and the circumstances of their summoning, as Companions and Acquaintances. Companions will be those joining the central "group" in a sense, having greater involvement in the Roller's actual story, while Acquaintances may end up just that: people or beings that may simply be too powerful, uncaring, or perhaps even evil to be directly involved in events. These labels will not be set in stone however, and story moments could lead to an Acquaintance becoming a Companion (and vice versa as well).
5) Some Summons are too abstract to directly summon, so they will instead be converted to some alternative power or effect. For example, if a patch update is summoned, this will likely be converted into some form of System Update.
6) e summoner cannot summon anything that poses an outright and immediate threat to themself or the world as a whole. For example, if a bomb is summoned, this bomb will not have a lit fuse. There are some exceptions to this (please refer to Rule 3b) but the limit will be things that would just immediately destroy the city, country, planet, etc. which the Roller resides in at the moment instantaneously. Such outcomes would be displeasing to the System.
7) Some things are outright too powerful to be summoned directly, such as Gods. The System is only near omnipotent after all! Instead, they will be interpreted and converted in some other form than direct summoning to the land, for better or worse! Lowercase gods however are summonable. One may call themselve's a god, but only Gods are Gods! Example: Kratos can be directly summoned, the Four cannot (to the gratitude of all things good).