Book of the Revenants.

Name: Gaze of the First
Rank: C
Power: E
Activation Cost: 5
Upkeep Cost: 4
Range: 10 meters
Speed: N/A
Element: N/A
Skill: Sensory Techniques | Kanchijutsu.
Classification: Secret
Requirements: N/A
Parent Technique: N/A
Hand Seals: N/A
Description: By connecting the chakra input of their eyes to that of their summoner, that summoner is then able to see everything the Pawn sees. Luckily, this also means the vision of the Pawn is unaffected by anything that impairs the vision of their summoner, such as Genjutsu or smoke clouds. It is also possible for the summoner to disconnect by winking with the affected eye, which simply cancels the jutsu as a whole, activating any and all cooldowns. It also comes with the ability for the summoner to communicate mentally over long distances with the summon for the duration of the jutsu.
Weaknesses:
Firstly, the summon can not see or sense chakra. It can only see what is observable via visual means.
Secondly, the summoner needs to give up the natural vision of a single eye in order to access the visual input of the summon. The summon is also vulnerable to Genjutsu but it needs to be specifically targeted at the skull, or just an AOE genjutsu that affects everything.
Thirdly, the very nature of losing an eye’s visual input to access that of the summon removes the user’s depth perception, making range and distance rather difficult to grasp.

Name: Castle of the first.
Rank: C
Power: C
Activation Cost: 5
Upkeep Cost: 3
Range: One meter
Speed: N/A
Element: Katon
Skill: Ninja Techniques | Ninjutsu.
Classification: Secret
Requirements: N/A
Parent Technique: N/A
Hand Seals: N/A
Description: Rook slams six of its fists into the ground, punching through the soil and conjuring a wall of flame that surrounds a meter wide area with the rook as centre.
Weaknesses:
Firstly, the jutsu locks up six of the summon’s limbs for if a single one stops making contact with the ground, the wall of flame vanishes in that direction, opening it up and exposing it.
Secondly, it’s FIRE. Fire burns. Fire sets fire to stuff and is hot. So it runs the risk of causing out of control flames or just being a little bit too hot to be comfortable for the people within the wall.
Thirdly, fire is weak to water. That is always going to be true here.

Name: Blast of the first.
Rank: C
Power: C
Activation Cost: 5 per fireball.
Upkeep Cost: N/A
Range: 0-35 meters
Speed: B+
Element: Katon
Skill: Ninja Techniques | Ninjutsu.
Classification: Secret
Requirements: N/A
Parent Technique: N/A
Hand Seals: Tatsu-Tori-Uma-Tora
Description: Rook brings up any pair of its hands, from a minimum of one to a maximum of four, to its body, forming them together and running through the hand signs. Each hand that successfully carries out the hand signs forms a fireball between it, which can then be launched towards their target(s)
Weaknesses:
Firstly, the jutsu requires each set of limbs to go through the full range of hand signs and have all the obvious chakra tells that give away the jutsu.
Secondly, interfering, destroying or damaging the limbs making the hand signs can absolutely prevent that set of limbs finishing the hand signs and denying a fireball.
Thirdly, it’s FIRE. Fire burns. Fire sets fire to stuff and is hot. So it runs the risk of causing out of control flames.
Finally, fire is weak to water. That is always going to be true here.