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Regarding the security issue, unfortunately a change on the server broke our certificate renewal, and by the time I realised we'd already been rate-limited by LetsEncrypt. The issue should now be resolved.
A bug was fixed a day or two ago that was causing only the first attack by an NPC to actually cause damage.
Health has been increased as part of the current update I'm working on, it now increases by 100 with each level.
Thank you for reporting this, it seems these battles were all Retreated from, and there is a bug with the Retreat feature not processing correctly. I've temporarily disabled the Retreat feature, these regions will be manually returned to their correct owners as soon as possible.