I've been revisiting anno 2205, infamously the ugly duckling of the Anno series of RTS games. I don't mind so much the fact that it's different, lacks customisation and random map generation - I'm bothered because the game is so slow to progress through on challenge settings, and it feels like a game designed just to artificially waste your time; in other anno games, you can always pull tricks to dig yourself out of economic crisis - selling off assets and surplus goods, completing quests for other parties, or taking loans. 2205 is very very confined in terms of what you can do to financially recover in the early game and forces you into a lot of military events.
Okay, this is splitting hairs: the tutorial pop-up is talking about the golden symbol in the bottom left. But it calls the symbol “Roundtable icon,” which doesn’t help. This symbol pops up at quite a number of places and prevents you from killing NPCs in those areas. Still, not FromSoft’s best communication with the player.
You can actually fight in the Roundtable Hold before Ensha (the guy in the skeleton armor) invades: When you jump down from the balcony to the lower floor, you get invaded by Mad Tongue Alberich. (He is relatively easy). This area is useful after defeating him, when you want to try out weapon move sets.
Ensha is not guaranteed to invade you. He only invades if you pick up either of the Haligtree Medallion halves and only if you do it before defeating Fire Giant.
Another character that can also violate the supposed safety of the Roundtable Hold is Fia. In one version of her side quest, she kills D in the Roundtable Hold.
For people who are further interested in video games that violate safe rooms: here is a video essay by Daryl Talks Games about the topic.
Yeah, it was Mad Tongue I believe. I got the notification and was exploring the hold and got deleted. Good shout though on the Roundtable Icon. I for sure did not pick up on the distinction.