Floating damage numbers: yellow for your hits, red for damage you take, violet for everyone else's, green for big heals. Fast hits gather into one number. Client-side only.
When you are hit or walk, the game moves the view but not the crosshair, so the crosshair briefly points at something a click would not hit. This draws it where your aim really is. Client-side only.
Armor trims take one short tooltip line instead of three: '■ Bolt · Amethyst' in the material's colour. Hold Shift for vanilla's three lines. Client-side only.
Floating damage numbers: yellow for your hits, red for damage you take, violet for everyone else's, green for big heals. Fast hits gather into one number. Client-side only.