How are monster’s skills calculated?
The other goblins are missing their racial bonus. According to Monster Manual p.278, the goblin has +2 racial bonus to +2 Stealth and Thievery. It's correctly reflected in all of the goblin statblocks ...
Can the melee attack of Skald's Armour be further than the actual melee range?
Both player and monster attacks need to follow the targeting rules. If skald's armor let you redirect a hit on hit or the damage on damage you'd be fine passing those on to a target out of enemy range,...
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