So it'd be something called Praxis Imortalis. or Crucifix (after the scar it left on him) a bio-mechanical weapon that would move through 'stages' the longer its used, and it takes about 10 seconds increasing linearly per stage (Stage 1 10 seconds, Stage 2 20 seconds, stage 3 30 seconds, stage 4 50 seconds. ect) with each stage stacking (so at stage 3 you have stages 1 and 2 still active)
1) The Wielder has increased, strength, stamina, speed, resilience, higher than that of almost any normal human (IE super-human feats)
2) The wielder's outer layers turn to metal, hair, everything. any edge becomes bladed, any smooth surface becomes armoured.
3) Two massive 'wings' are formed from the users back, these 'wings' are metallic and covered in minuscule blades, capable of ripping most normal creatures apart and turning them to kitty kibble.
4) The user becomes capable of channelling lightning/electricity, allowing them flight as well as the capability of hurling bolts of lightning, forming St elmo's fire, and even plasma.
5) any Non-organic matter around the user is converted to energy to fuel stage 6, forming a sort of barrier. (so you can still punch him, but shooting him has no effect)
6) The energy Density of the user becomes so high that they generate a micro-singularity allowing for the warping of time up to a degree, the longer stage 5 was in use, and the longer this stage is running the higher the warping gets, the growth is inverse exponential. starting at 1:30
Example; 1:30, 1 minute for real world is 30 minutes for user, +1/2 1:45 1 minute real world is 45 minutes for user, +1/4 original value (rounded up) 1:53, +1/8 Orignial value (rounded up) 57:1.
You get the idea, while it grows as he uses it, it grows slower and slower, and the growth rate is real time, so its diminishing results over extended time.
7) Upon reaching 'critical mass' (something yet to be determined, for balance reasons) The user can expel all the energy contained within the mico-singularity in a detonation capable of Not only wiping small islands off the face of the earth (think small carabian island, so maybe 10 miles by 10 miles) but also Nullifying all powers (effectively a 'silence' ability) However it is suspetable to itself, so while power uses are protected from the blast (including the user of Praxis Imortalis), all power users are stripped of their powers for 5-10 minutes.
So its insanely powerful, but on a small scale. the idea behind it being that rather than being able to effect a large area in a 'mildly' devastating way (wiping every city in a country off a the map) it effects a smaller area in a far more destructive manner (your island is missing, just gone.) Hence the term local-galactic, if it was scaled up it'd be capable of not just 'mess up' a galaxy but remove it from the universe. hence the far smaller scale than 'national' he can most defiantly fuck up a country, no 2 ways about that. but it'd require some actually thought.
I'm happy for you to nerf/buff it if you want to. also that's a 'source' of super powers you forgot, biological weapons/ enhanced humans. but anyway.