Soul Synergy

Introduction

Soul Synergy is one of the more mechanically interesting Tower of Knowledge skills introduced in Infinity Kingdom, largely because it challenges how most players think about healing. It is Conquest-exclusive and obtainable only through the USD 20 seven-day recharge bundles, which makes it paywalled but still relatively accessible compared to Wisdom Well–locked skills. Because of that, it often gets evaluated too quickly as either “underwhelming” or “situational,” when in reality its value depends almost entirely on whether the player understands how different healing mechanics interact with troop distribution, energy regeneration, and damage scaling.

This article takes a practical look at how Soul Synergy actually functions, why it feels weak in standard marches, and why it becomes genuinely valuable once you deliberately build around it.

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Understanding the Skill’s Core Mechanic

Soul Synergy establishes a permanent mental link with all allies at the start of battle. Every time a linked Immortal casts an Ultimate Skill, that same Immortal restores HP based on a 240% recovery rate. There is no cooldown and the targeting logic is unique as it simply goes for “whoever cast the Ultimate gets healed.”

That detail is what makes the skill unusual. Most healing in Infinity Kingdom is reactive or blind splashed AoE (e.g. Vitality Touch targeting the immortal with the highest troop losses, meaning rarely your main carry. Or Divine Gift from Theodora spashing AoE heals blindly to everyone). Soul Synergy is unique as it does not attempt to save whoever is closest to dying, instead Soul Synergy does the opposite: It keep whoever is active topped.

On paper, 240% recovery does not look especially impressive. In isolation, a single trigger is rarely fight-deciding. The power of the skill lies in repetition. Every additional Ultimate cast is another instance of sustain, and over a long fight those instances add – if, and only if, your march is built to generate them.

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Why Healing Targeting Matters More Than Raw Numbers

To understand where Soul Synergy fits, it helps to compare it properly to Vitality Touch, which has been a meta skill for a long time so most players are well versed with it by now making it a nice comparison to Soul Synergy as we go over how to think about your setup and build when picking healing skills:

Vitality Touch is a single-target healing skill that always heals the Immortal who has lost the most troops. In practice, that almost always means frontline tanks or support Immortals running Assist or defensive passives. Those units are designed to take damage, so they frequently sit at the lowest troop count and therefore absorb the bulk of Vitality Touch’s healing.

There is nothing wrong with that. Keeping tanks alive is essential. However, from a damage perspective, this kind of healing is inefficient. Your primary damage dealer is usually the Immortal you invest the most into protecting, positioning, and troop preservation. Because of that, they are rarely the lowest-troop Immortal, which means they benefit the least from Vitality Touch even though maintaining their troop count has a massive impact on total damage output.

Soul Synergy changes that equation. Healing is no longer tied to who is suffering the most losses, but to who is casting the most Ultimates. If you deliberately build energy regeneration on your damage carry, Soul Synergy will funnel healing directly into the Immortal whose troop count matters most for winning the fight.

This is the key distinction. Soul Synergy does not heal “better” than Vitality Touch by default. It heals differently, and that difference dramatically alters the value of each point of healing depending on how your march is constructed.

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Energy Regeneration as the Enabling Factor

Without energy regeneration, Soul Synergy is mediocre. With it, the skill starts to make sense.

Every Ultimate cast triggers healing, so any build that increases casting frequency directly increases sustain. Skills like Energy Mastery, Psionic, Energy Burst, Adrenaline Rush and Corrosive, as well as Surge artifact investment, and Immortal passives or Matilda’s energy regen ultimate skill all help boost energy gain all amplify Soul Synergy’s effectiveness. In these setups, your damage dealer is not just outputting more damage through faster casting; they are also sustaining themselves in parallel.

This creates a feedback loop. Faster energy leads to more Ultimates. More Ultimates lead to more healing. More healing preserves troop count, which increases damage output and prolongs the fight long enough for the loop to repeat.

In contrast, in slower marches where Ultimates are infrequent, Soul Synergy simply does not trigger often enough to justify occupying a support slot.

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Practical Performance From Testing

In practical testing, Soul Synergy has performed best in marches already designed around tempo rather than raw durability.

Fire compositions with strong energy generation are a good example. When paired with Energy Master Wu, Soul Synergy provides steady sustain that noticeably improves long-fight consistency without sacrificing offensive pressure. The healing is not explosive, but it is reliable and, more importantly, it lands on the Immortals doing the work.

Regen-centric builds also benefit, particularly when combined with Immortals that naturally scale energy. Matilda-based setups are a good illustration of this. When her energy regeneration is properly supported through skills and artifacts, Soul Synergy becomes a meaningful contributor to survivability. Without that support, it quickly falls behind more traditional healing options.

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Immortals That Naturally Fit the Skill

Soul Synergy is at its best on marches built around Immortals with high or scalable energy regeneration, such as Anubis, Hippolyta, Matilda of Flanders, and Theodora when paired with Surge artifacts. These Immortals can trigger the skill frequently enough that the cumulative healing becomes relevant over the course of a battle.

That being said, you should synergize further with regen skills like Rage Blessing, Energy Master, Psionic, Corrosive, Burst, etc. and with Matilda’s ultimate if possible to get full effect. If you are doing a hyper regen build like this focusing on regen on perhaps multiple different immortals – then Soul Synergy is very good! If you are NOT building into regen, then you will get very very low value out of it. It is a highly niche skill that requires synergy to shine.

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Acquisition and Real Cost Context

Soul Synergy is only available during Conquest and only through the USD 20 seven-day recharge bundles. Each daily purchase provides five skill stones, and completing five purchases within the same chain grants a twenty-five stone bonus. One completed chain therefore yields fifty stones for USD 100.

Since Soul Synergy requires sixty stones, the effective cost is best evaluated using average stone value rather than marginal spending. Veteran players repeatedly buy these chains for the broader skill pool and long-term value, which places the average cost at roughly USD 2 per stone. Under that model, Soul Synergy effectively costs around USD 120.

Compared to Wisdom Well acquisition, Soul Synergy remains one of the less expensive premium sustain skills available.

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Conclusion

Soul Synergy is not a universal healing skill, and it is not meant to be. It is a precision tool that rewards players who understand how energy regeneration, troop scaling, and healing targeting interact.

Used without intent, it feels underwhelming. Used correctly, it allows you to redirect sustain toward the Immortals that actually decide fights. For players willing to build around tempo and Ultimate uptime, Soul Synergy offers a level of control over healing distribution that few other skills can match.

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Published: 03-01-2026