1.52.2 Update
I'm super excited about this update because I believe it will make lesser known / less popular builds and strategies MUCH more viable! For example, the Curse/Stall build will be a viable option even in single player due to the new Decoys. And there's much more like that but I'll leave it to you to figure out how to leverage these runes.
Shoutout to @scobjo for making an incredibly well composed document pointing out some of the gaps in balance, may changes from that document made it into this update.
New Content
Rune: Precision
Thanks @PiElRoja
Rune: Whirlpool
Rune: Plague Doctor Mask
Thanks @Arivia!
Rune: Reflex
Rune: Hardened Minions, Sharp Teeth
Rune: Thorny Decoys
Rune: Witch Bane
Thanks @Monarch!
Rune: Blood Warlock
Rune: Icy Veins
Thanks @VinnickTalberot!
Rune: Winter's Chill
Thanks @VinnickTalberot!
Rune: Investment
Thanks @Akira!
Rune: Blood Letting
Thanks @Monarch!
Rune: Town Portal
Thanks @Arivia!
Rune: Last Stand, Contaminate on Kill, Hat of Despair
Thanks @Arivia for Hat of Despair!
Added 2 new decoy upgrades
Upgrades to Poison
Thanks @Scobjo!
Balance Changes
Plague Doctor Mask cost adjustments
Make Contaminate on Kill more expensive
Since it transfers the stacks of the curse too, it's SUPER powerful.
Make reroll runes cheaper
Swap Rare → Uncommon
Recall: Uncommon → Rare
Thanks @Scobjo!
Bug Fixes
Fix: Desync with unit movement
Units with leftover paths now clear their paths before receiving stamina.
Fix: Spellmason clone movement timeout
AI units now handle stamina changes correctly to prevent timeout issues.
Fix: Blood Curse + Debilitate stage order
Blood Curse now applies before Amount modifiers.
Thanks @Varion!
Fix: Goru resurrecting more than once
Undying now removes itself properly.
Thanks @Weedybird!
Fix: Freeze immunity not working via non-spell sources
Thanks @Varion!
Fix: PlagueBringer working while dead
Thanks @AlchemyExists!
Fix: Missing mana SFX for 'send mana' and 'steal mana'
Fix: Clones casting 'clone' on enemies
Thanks @RAHHHHHH :3!
Fix: Privacy policy overlapping menu logo
Fix: Changelings' cast delay issues
Fix: Prevent out-of-bounds spawns
Thanks @Rampantegecko!
Fix: Purple Portal clearing shields and mana overflow
Fix: Purple Portal resetting quicksave on level start
Thanks @Lost and @eps!
Optimization
Improve recall
Units no longer pack together at the same spot.