Summoning Rules <--- some deny this ability as yet.
ºChakra Costº
Bijū cost 20% of the user's total (not current) chakra to summon, even in succession.
ºControlling Mechanismº
Bijū must be under the influence of genjutsu at all times while used as a summon. Regardless of the genjutsu's potency, it will tax 5% of the summoner's total (not current) chakra while it's actively being used as a summon, the taxation only ceasing when the bijū has been removed from the field. Techniques capable of transferring chakra from the bijū to the summoner are strictly prohibited from being used in this context.
ºRestrictionsº
Summoners are restricted to one action per post, be it offensive or defensive so long as the bijū is summoned.
ºProhibitionsº
Enhancements to the bijū, such as encasing it in Susanoo are prohibited.
ºDrawbacksº
Bijū utilized in this manner will always possess a hateful disposition towards their summoner, this is static. Should a chance ever arise and they gain the ability to act of their own volition, they will prioritize slaying their ex-summoner first, regardless of the presence of any other actors.
ºDeath of Summonerº
If the summoner dies while the bijū is unsummoned and located in inaccessible territory (such as a pocket dimension), it will re-spawn within a week's time where the summoner was slain.