"Hmm." Taraliel considered his options. He could, of course, have attempted to slay the creature on the spot, but such spells had a tendency to do nothing if they failed. Besides, this monster was obviously quite tough. It had a fair chance of shrugging off any spell he threw that could damage it. Better to be sure. He boosted the strength of his magic temporarily, and then threw a bolt of necromantic energy at the beast. After that, he studied it for weaknesses he could report to his fellows.

Attack - (1d20+12)[14]
Penetration - (1d20+30)[47]
Planes - (1d20)[7]

Spoiler
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Casting assay spell penetration, followed by avasculate, and then knowledge (the planes) for dark knowledge (tactics).