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.
✕removedBitter ChillNo longer levels with Walrus Punch!
▼nerfBitter ChillAttack Speed Slow rescaled from 20/40/60/80 to 17 + 3 per level
⇄adjustBitter ChillNow only affects enemy heroes
⇄adjustTag TeamNow always a basic ability for Tusk
✕removedIce ShardsNo longer upgraded with Aghanim's Shard
⇄adjustDrinking BuddiesNow granted by Aghanim's Shard
⇄adjustDrinking BuddiesTusk reaches out to tag an allied unit, pulling them closer. Once tagged, both Tusk and his tagged ally gain 25% bonus movement speed and 10 bonus armor for 6s. Can be put on alt-cast to only pull Tusk towards his ally with 50% reduced cast range. Cast Range: 1000. Mana Cost: 80. Cooldown: 14s