Two things to bear in mind (with all my monsters)
1) The defences assume you use the Escalation Die rules from 13th Age. If you don't, I would drop them by 3
2) I use Chris Perkin's damage expressions (base average damage value of Monsters Level +8), so my beasties do quite a bit of damage. You will sometimes see monsters (brutes mostly) that have poorer attack mods, but that inflict a lot more damage. You have been warned! My minions also deal quite hefty damage (starting at 9 points per hit for a 1st level minion and increasing by +1 at every odd numered level thereafter, so a 25th level Minion is hitting for 21 damage, 42 on a crit)
3) You need to add half the monster's level to the ability mods to get the total score. So, Gustor's Strength mod is +23.