OthoSpoiler
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Init:18 Move: 50' (mounted) HP: 108/108 AC: 28 Fort:12 Ref:7 Will:15 Effects: Barkskin (+4, shared), Air Walk (shared)
Vandalin: HP 68/68 AC 26 Fort +10 Ref +9 Will +7 Effects Barkskin (+4, shared), GMF (+2), Air Walk (shared)
"Ignore the humans; the elf is the threat. Vandalin, Defend." Otho guides Vandalin up and forward while casting another, more involved spell.
Spoiler
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Move to (10,07)-(12,06), 15' up. Yes, I forgot '11' on the column numbers. Cast Summon Nature's Ally V. Auto success on Handle Animal, Ride (Guide with knees and Fight with Warhorse) and Concentration (Moving Mount) checks. I'll choose the spell particulars when it goes off on Otho's next turn.