We split them up in our campaign. Word to the wise, make sure you change the wording on the swords to when you roll an natural 20, not when you score a critical hit. The assassin in my group is generating a wind storm at the start of every round and only the PC with the ring is happy about it.
Personally, I don't like items that grant static ability scores. I don't like the way Gauntlets of Ogre Power or Girdle's of Giant Strength are portrayed in 5e. I've changed them to +2 strength capped at 19, double carrying capacity, can push, trip etc, creatures up to Huge size, and +4 strength capped at whatever is appropriate to the type and frost giants should be a point higher than stone giants, triple carrying capacity, can push, trip etc, creatures up to Gigantic size, and advantage on strength checks.
You can do something similar with Icosiel's Circlet of Persuasion, +2 Wisdom and +2 Charisma (both capped at 18), Advantage on Diplomacy checks, and Suggestion spell 1/day. It should be attuned though. They shoved it the Bag of Holding in my campaign and forgot about it so nobody is aware of the power up.
Did you play this in 3.5, your own conversion, or with my conversion? The Sword of Aqaa generates a gale force wind at 1 creature, not a room (at least how I read it). The plural of "creatures" I think was just to refer to groups of creatures by size class rather than affecting an area. It is a longsword, so an assassin in 5e cannot get an automatic critical with it as it is not a finesse weapon. As it stands, it is most appropriate for a martial class.
In my conversion, the Circlet of Wisdom gives Wisdom +1 in chapter 1, +2 in chapter 6, and +3 in chapter 11. These bonuses can cause an ability score to go beyond 20. The 3.5 circlet of persuasion only granted a +3 bonus to Charisma checks (no mention of casting a spell). So the 5e version could have given advantage to Charisma checks, but I thought a circlet of Persuasion giving advantage to a Charisma (Intimidation) check seemed odd. So I limited it to just Charisma (Persuasion) checks.
EDIT: Sorry, I realize I mixed up the Assassinate class feature with the restrictions in the Sneak Attack class feature. My reading of this along with the intent of the weapon is that the assassin would score a critical hit with the longsword, but it only affects the struck creature, not the room. Additionally, the assassin would not get sneak attack damage.
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