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.
✕removedDauntlessNo longer considers Mars's allies when determining if Mars is outnumbered
▼nerfDauntlessHP Regen per extra enemy decreased from 70% to 40%
⇄adjustBulwarkNow a point targeted ability. Mars will face towards the targeted direction when toggled on
✕removedBulwarkNo longer upgraded with Aghanim's Scepter
⇄adjustArena Of BloodNow upgraded with Aghanim's Scepter
▼nerfArena Of BloodLowers cooldown by 10s and increases duration from 5.5s to 6.5s. If an enemy is killed in the Arena, Mars and all of his allies inside the Arena restore 35% of their max health and mana and get a 35% attack damage buff for 20s. This effect stacks