I personally find having 24 powders take up tons of my inventory slots annoying so what I suggest is to make a pouch like an emerald pouch for them how it would work would be this: each powder is a more fine substance like sugar in their respective colour and the higher tiers are sugar cubes of the colours, the first level pouch would contain say 9 tiers(3 tier 3s , 9 tier 1s etc) and higher levels would contain more like a stack or so. This would be a feature I would like to see in the game and I have even made concept art for this(if I remembered to I'm lazy ok)
Now for the other part some world events id like to see are: The void child, world event that would be found in the void islands and summoned once a week like Annie. Then there's the Leviathan a peaceful creature that roams around the ocean and can be rid on like an island however once per week or so it would dive down into a burrow and start mauling the peaceful travellers. The prototype a boss in gavel that would yet again be summoned once per week or so, it would be Urelix's latest work and every time its summoned it adapts to a playstyle/archetype/class it would be a metal human amalgam forced into aggression against anything by the dying villager souls cursing Urelix and wishing him death. And for my final idea Nohno the crazy chicken man who swore vengeance against the player for killing Cluckles.