devtrackers.gg
Shadowflame is actually just an item for AP champs to buy versus squishies. While serpent Fang scales against resists by effectively dealing (remaining shield at early expiration) true damage to affected targets, shadowflame is actually just not useful versus bulky shield users. Sion, Poppy, you get the picture. Both of these champions effectively take thousands of true damage over the course of a game from serpents fang though.
How to help:
Without making it a proper tank buster:
Shadowflame passive takes a percentage of the users magic damage on a shielded target and applies it directly to their health, thus penetrating the shield. That percentage could be equal to the flat magic penetration of the user (less effective versus tanks but still great for assassin users).
Making it mildly tank busty:Shadowflame passive causes the user to deal increased magic damage to shielded enemies. That increase could be equal to the users flat magic penetration or percentage magic penetration, whichever is greater.
Just use what works AKA literally make it AP serpents fang (fairly tank busty)
UNIQUE – SHIELD REAVER: Dealing damage to an enemy champion injects them with shadowfire for 3 seconds, reducing any shields they gain within the duration by (melee 50% / ranged 35%), and if the target was not already afflicted by the shadowfire, reducing all of their active shields by the same amount.
That's it, those are my thoughts.
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