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According to wiki :-Healing rate -27 and cancel buff from food and leadership bonus (change with the new update)-Crit res -20%-Bleed res -20%
I think the poison resistance reduce the number of poison point received (Example : you received 100 poison points, you have 20% resist poison so you only gain 80 poison points).The poison don't directy damage, it reduce your healing rate, making it negative so you lose HP over time.