Tend Damage 2 (Source)
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Source Text - Tend Damage (Ability)
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Heal give XP, tend Doesn't
Heal needs you to have a Stim kit in your inventory to fucntion, tend doesn't
Heal takes a bit from your mind bar when used, Tend gives you wind wounds when used
Heal does Sitm pack level of healing, tend does worse than the worst stim worth of healing
Basically, tend is for people who don't have stim packs and need to heal someone NOW