Talk:Orokin Tower/@comment-176.58.185.252-20151226193509/@comment-113.252.154.114-20151227113450

I think that the spawn of both Bombard and nullifier are based on the level range of the wave. As such, when the wave spawns enemies with level 30+, the spawn table adds a chance of bombards and nullifiers appearing as well.

I noticed them appearing whenever we reach wave 25 on T2 Def and 35 on T1 in which, enemy level are on the said range.