*You have a multiversal throne of heroes and may call forth the power of heroic spirits. This encompases all legendary beings, those present in myth or composed of myth, and any entity that has as qualified as a servant. By default you can only call upon those present in the Nasuverse. Traveling to new universes will add those legends to your multiversal throne of heroes. None of the heroic spirits in your throne can be touched by powers other then yourself.
*Your body is altered and becomes a perfect vessel for any heroic spirit weak or strong. You can summon any heroic spirit into yourself and channel their power no problem. You can also opt to fuse totally with a heroic spirit and in essence become them with all that it entails. Their memories, biases, and any potential curse will only affect you if you wish it to. Note that they will still exist recorded in your throne.
*You can opt to summon a Heroic Spirit in the flesh as a proper servant or fuse them with another into a demi-servant. Heroic Spirits require no upkeep and generate their own magic as they are functionally alive again.
*Your charisma is massive, you could become an incredibly influential figure if you put that talent to use in the public sphere. Your compatibility with getting along with others is off the charts. Even the most egotistical or human hating Heroic Spirits recorded will work with you at the very least. If you put effort into actually interacting with someone you will notice they will rapidly bond with you.
*Heroic spirits you summon are bound by your command seals which you have three that regenerate after a day. You cannot lose these command seals.
*You may alter the parameters of any heroic spirit you have in your throne and have them manifest in said spirit. Something like making an alter or genderswapped heroic spirit for example would be child's play. You can also take two or more heroic spirits and cram them into the same container creating an amalgam of those spirits. You could have this create a new dominant personality, a split personality, or some sort of fusion of all the personalities. These altered heroic spirits are saved separately from the original so none of the original is ever lost.
*Heroic spirits are not restricted to class containers such as the classic seven of the Holy Grail War. They are able to make use of the abilities and items they had while living. You may choose to apply any effects that legends might have had on a Heroic Spirit like Vlad III gaining vampire like qualities.