Ironclaw Boots
You gain a +2 bonus to Wisdom (Animal Handling) checks. Once per long rest, when your attuned animal companion or familiar would be reduced to 0 hit points, roll 1d4.[1]
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Complete rules
Handler’s Instinct You gain a +2 bonus to Wisdom (Animal Handling) checks. Beast’s Resilience Once per long rest, when your attuned animal companion or familiar would be reduced to 0 hit points, roll 1d4. Instead of falling to 0 hit points, it regains hit points equal to the result rolled.[1]