Your studies of nature and arcana are one and the same, further improving your bonds with nature.
Benefit: Your levels in all classes which grant the ability to cast arcane spells count as levels of druid for purposes of determining the power of your nature bond and wild empathy class features. For example, a druid 3/wizard 3/mystic theurge 3 counts as a 9th level druid for these purposes, including determining which domain spells the druid possesses (if the druid’s nature bond is in that form) and determining the druid’s caster level when casting these domain spells. Additionally, you may sacrifice a spell from your arcane spellcasting class to spontaneously cast a summon nature’s ally spell (as with the Natural Mystic feat) one additional time per day.
Undefeatable: The Collected Feats Sourcebook, Copyright 2009 – 2010, Louis Porter Jr. Design, Inc. Undefeated, Copyright 2011, Louis Porter Jr. Design, Inc.