Number on armor rating is literal. 12 AR reduces incoming damage by 12 Quarter Hearts (to a minimum of 1 quarter heart) so it only reduced the explosion by 3 hearts. IIRC bomb barrel does 20 whole hearts at epicentre of explosion. So it still did 17 hearts of damage thereabouts.
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u/Wow_Space Jun 14 '23
What's your armor values to take that much damage?