Bane magic for SLAs

[Yogibear41]

Looking for something similar to the Bane Magic feat from heroes of horror that will work for SLAs.

Working on a possible SLA based build, and I already know about Mortal Bane, but there is a chance I will be running into alot of outsiders/undead as well and I wanted something for fighting them.

[Thurbane]

As well as Mortal Bane, there is the exalted version, Purify Spell-like Ability, which deals extra damage against evil outsiders.

You may have trouble qualifying for both...

[Yogibear41]

Character would be LE so definitely no exalted feats.
One of those evil vs evil scenarios.

[Troacctid]

You could just use Bane Magic, if your DM okays it. It's not even really outside the realm of RAW, depending on how broadly you're willing to interpret "In all other ways, a spell-like ability functions just like a spell."