Lines are quoted from the official notes; buff/nerf tags are auto-classified from the numbers and can be wrong. Covers the 14 most recent Dota 2 patches PatchMeter has fetched.
⇄adjustSilent as the GraveNow innate ability. Active
▲buffSilent as the GraveMana Cost decreased from 115 to 50
▼nerfSilent as the GraveCooldown changed from 45s to 45.75s - 0.75s per level
⇄adjustSilent as the GraveIncreases bonus movement speed by 12%, bonus damage by 10%, bonus damage duration by 2s, and flight duration by 10s. While flight is active, Silent as the Grave grants invisibility to Visage and his familiars
▲buffSummon FamiliarsCooldown decreased from 130/120/110s to 120/110/100s
⇄adjustSummon FamiliarsFamiliar Health rescaled from 500/600/700 to 450/600/750
▲buffTalentsLevel 20 Talent Soul Assumption Damage Per Charge increased from +25 to +30