Quote Originally Posted by Korihu View Post

But there is one thing, Synastry DOES boost your healing by 25% on the target. Unless they changed it completely from how it works in Wolves Den Pier.

The actual main heal number isn't boosted, but the target still receives that extra 25%. I tested it myself live on stream, here are screenshots before and after Synastry and I can give you the clip on Discord since I'm not sure they allow twitch clips here.
Good catch. I'll edit OP, definitely didn't see that since it's so small and off to the side. Just verified it with a video I had from a match in Feast, so definitely not specific to WDP.