spoilers
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If you do get him knighted and then he kills or you kill Saerk.. he leaves immediately. All you are left with is his armor.
I believe if you don't get him knighted he eventually makes trouble in your party and either fights or leaves.
Cloudy
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Raindancer of the Laughing Hyenas Clan
Storm-Queen
StormCloud of the Black Knight: Heart Mind Soul Forever
"To sleep, perchance to dream..."