I believe anyone who owns/used the spell would agree with me. Compared to shrike or sentinel, the Shadow Seraph is an extremely disappointing spell. Here's what it does right now:
+25% outgoing heal +25% incoming damage +100 absorb on heals (lose backlash from healing, gain backlash from shields, blades, traps, basically anything that isnt a heal)
It sounds okay on paper until you remember spells such as cycle of life and guiding light exist, cycle of life is also 25% outgoing and 10% increased death damage, which is a far superior choice compared to 25% incoming damage, and the 100 absorb barely helps at all.
I would propose the changes: +40% outgoing heal (more then a guiding light but this costs a shadow pip) +25% incoming damage (keeping its main weakness) (one of the following below) -places a reverse lord of the night trap on allies when healed (traps that increase the next incoming heal) -250-400 absorb shield -300-500 HoT (can be crit)