Patch 0.18.4.14 is primarily a bug-fix patch.
Fixed crashing and/or broken mission panel on certain browser builds and MacOs
Fixed combat calculation with respect to attackers with zero strength erroneously getting the benefits of slayer and/or frailty
Fixed sourced abilities not falling off for minions on the right side of the 2v2 board when the source leaves play
Fixed Desertification Engine active ability
And various other bugs
Chat is NYI
Guilds are NYI
Minor combat calculation difference for fragile vs. what is intended (see blog post linked above)
Junkyard Valhalla can miscalculate the dredge restriction in 2v2 and / or if there are more than one Junkyard Valhalla in play